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Topics covered here:
DS & Algo
Java
Multithreading
Collections
Spring
Hibernate
Design Patterns
SQL
Web Services
OS
Networking
Puzzles
HR
Other General
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Java
Multithreading
Collections
Spring
Hibernate
Design Patterns
SQL
Web Services
OS
Networking
Puzzles
HR
Other General
*************************
Combined problems
IPC
Beautify input json
Given string and regex , give no. of times it occurs.
Find next greater number with same set of digits
Determine whether a point is inside a polygon?
Number of squares in chess , gneralize it
Tug of War problem
Given binary tree , sum of each level
Length of longest substring with no duplicat character
8 ball puzzle
Design parking lot
paging in os
regex for email
Given BST , traverse only left sub tree
Red Black Tree
AVL tree
Find the maximum number that can be formed from the digits of given number
Design elevator ,
parse xml , store outpout in json
find prime number in given range
what are cookies
how to maintain sesion
angle between hour clock and minute
Design data structure that supports insert,delete , find max , delete max in O(1)
Convert roman to integers and vice versa
Number of BST from 1 to n
Given array , create another array which contains product of all elemetns except ith aray , witout using divioson.
Implement hash tables
find maximum weight matching in bipaartite graph
3 , 7 , 5 liter milk container puzzle
sort stack using only another stack
how threading works at cpu level
thrasing?
page replacement policies?
paging?
page fault?
How a server works?
compilation vs interpretation?
Beautify input json
Given string and regex , give no. of times it occurs.
Find next greater number with same set of digits
Determine whether a point is inside a polygon?
Number of squares in chess , gneralize it
Tug of War problem
Given binary tree , sum of each level
Length of longest substring with no duplicat character
8 ball puzzle
Design parking lot
paging in os
regex for email
Given BST , traverse only left sub tree
Red Black Tree
AVL tree
Find the maximum number that can be formed from the digits of given number
Design elevator ,
parse xml , store outpout in json
find prime number in given range
what are cookies
how to maintain sesion
angle between hour clock and minute
Design data structure that supports insert,delete , find max , delete max in O(1)
Convert roman to integers and vice versa
Number of BST from 1 to n
Given array , create another array which contains product of all elemetns except ith aray , witout using divioson.
Implement hash tables
find maximum weight matching in bipaartite graph
3 , 7 , 5 liter milk container puzzle
sort stack using only another stack
how threading works at cpu level
thrasing?
page replacement policies?
paging?
page fault?
How a server works?
compilation vs interpretation?
DS , Algo ,Bit Magic (Solve each problem in every possible way)
1. Write code to find loop in linkedlist
2. Write code to reverse a linkedlist
3. Write code to reverse a string without using any API.
4. Implement Djikstra.
5. Write code for DFS,BFS,inorder,preorder,postorder,zigzag in tree.
6. Implement quick sort.
7. Implement merge sort.
8. Implement autosuggest feature from a list of words.
9. Implement LRU.
10. Write code to find diameter, height of tree(or binary tree?).
1. Write code to find loop in linkedlist
2. Write code to reverse a linkedlist
3. Write code to reverse a string without using any API.
4. Implement Djikstra.
5. Write code for DFS,BFS,inorder,preorder,postorder,zigzag in tree.
6. Implement quick sort.
7. Implement merge sort.
8. Implement autosuggest feature from a list of words.
9. Implement LRU.
10. Write code to find diameter, height of tree(or binary tree?).
13. Write code to check if a number is power of 2.
14. Write code to search a number in rotated array.
21. Write code to check if a number is prime.
14. Write code to search a number in rotated array.
21. Write code to check if a number is prime.
Find LCA(Lowest Common Ancestor) in a binary tree.
12. Write code to find number of set bits in an integer.
5. Write code to find kth element from end in a linked list ?
6. Write code to find the missing number in an integer array having 1 to 100 in random order except a number.
10. Write code to check if linkedlist is palindrome.
12. Implement Prim.
12. Write code to find number of set bits in an integer.
5. Write code to find kth element from end in a linked list ?
6. Write code to find the missing number in an integer array having 1 to 100 in random order except a number.
10. Write code to check if linkedlist is palindrome.
12. Implement Prim.
15. Write code to search a number in a sorted 2d matrix.
16. Write code to print 2d matrix in spiral order.
17. Write code to find kth largest element in an array.
18. Implement stack using queue.
19. Implement queue using stack.
20. Implement two stack using an array.
21. Implement three stacks using an array.
19. Write code to check integer is palindrome.
19. Write code to check string is palindrome.
20. Write code to find maximum continous subarray in an array.
21. Write code to find longest palindrome substring in a string.
22. Write code to find best time to buy sell stock.
16. Write code to print 2d matrix in spiral order.
17. Write code to find kth largest element in an array.
18. Implement stack using queue.
19. Implement queue using stack.
20. Implement two stack using an array.
21. Implement three stacks using an array.
19. Write code to check integer is palindrome.
19. Write code to check string is palindrome.
20. Write code to find maximum continous subarray in an array.
21. Write code to find longest palindrome substring in a string.
22. Write code to find best time to buy sell stock.
22. Write code to swap two numbers.
23. Write code to find sum of digits
24. Write code to reverse an integer.
24. Write code to print first n numbers infibonacci series.
25. Write code to print nth fibonacci number.
25. Write code to add two numbers represented by a linked list.
26. Write code for bubble sort.
27. Implement radix sort.
28. Implement counting sort.
29. Implement insertion sort.
30. Implement selection sort.
31. Implement heap sort.
32. Implement bucket sort.
33. Write code to find first repeated character in a string.
34. Write code to find first unique character in a string.
How to find middle element of linkedlist in one pass?
Write code to remove duplicates from an array.
Implement BST.
Implement doubly linked list.
Implement doubly linked list using single pointer.
Write code to convert decimal to binary.
Write code to sort a map by value.
Write code to find common elements in two arrays.
Find longest substring without repeating characters.
Determine whether a point lies inside a triangle.
Nuts and bolts problem.
What is the probability that knight stays inside the chess board?
Implement stack using likedlist.
Implement queue using linkedlist.
Check for balanced paranthesis in an expression.
Sort an array containing only 0 and 1.
Sort a linkedlist containing 0,1,2.
Minimum number of platforms required at railway station.
convert word to another , one time one character , from a list of words.
Break string into dictionary words.
Find seed of a number. A number X is seed of Y if multiplying X by it's digits equates to Y.
Finds pairs of numbers with difference k from an unsorted array.
Find number of trailing zeros in a number factorial.
Given an array containing 0 and 1 , find the largest subarray cotaining equal number of 0 and 1.
Sort an array of elements by decreasing order of frequency.
Given an array of words , group all anagrams in set
Find the min element in a sorted rotated array.
Delete all leaves from a binary tree.
Find two elements in an array whose sum is closest to zero.
Given two rectangles if they overlap or not (Imp)Find max sub square submatrix in a 2d matrix of 0 and 1 with all 1.
Minimum coin problem
Rotate an array by k
Find the level of a given node in a binary tree
Implement heap sort
Implement priority queue.
Find difference in the sum of nodes at odd level and nodes at even level of a binary tree.
Check for children sum property of a binary tree.
Inorder predecessor in a binary tree
Inorder successor in a binary tree.
Rotate linked list by k nodes
Sort an array of 0,1,2.
Find pair of elements in an array whose sum is equal to given number.
Check whether two strings are anagram.
Given a linked list , each node has two pointers , one point to next , another to some random node , How to copy it ?
Get intersection point of two linked lists. (imp)
count nodes in a tree
determine if two binary trees are identical?
Implement binary search algorithm(imp)
sort an almost sorted array with two elements swapped
merge two sorted array without using extra space , assuming first array has enough space
Find minimum distance between two elements in an array
Print all the leaders in an array.
Given a 2d matrix m of 0 and 1 , if m[i][j] is 1 , fill row i and col j with 1
Replac each element of an array with next greatest element.
Find row with max 1 in sorted matrix
Find the number occuring odd number of times in an array , rest occur even number of times.
Given k sorted arrays of size n , merge them.
Find all pythogorean triplets in an array.
Convert sorted array to balanced BST.
Find LIS contigous.
Find LIS non contigous.
Find sub array whose sum equals given number.
Find max diff. between two elements in an array such that larger appears after smaller.
Find majority(occurs more than half) element in an array in O(n).
Even numbers at even pos , odd at odd in an array
Find union and intersection of two arrays.
Find smallest positive number missing from an array.
Shift zeros to end of array
Reverse linkedlist in group of k
Remove spaces from a sentence.
Reverse each word of a sentence
multiply two numbers using min. number of additions
detect cycle in graph
print bottom view of binary tree
print top view of binary treeadd two integers without using +
randomized quick sort
In a 2d matrix , a sub square matrix is painted , find minimal/optimal cost of painting the rest using a fixed block. which block to use ?
Floyd WarshallA 2d matrix containing 0,1,2 , 0 -> empty orange , 1-> fresh orange , 2-> rotten orange , how much time so that all are rotten , a rotten orane will rot adjacent (not diagonal) in one time frame.
Given a binary tree, n and k , find sum of all nodes which are k nodes away from node n.
mirror a binary tree
check if two binary trees are mirror
Convert BST to DLL.
check binary tree is bst
convert sentence like 'these are twelve pens and two shirts. convert it to 'these are 12 pens and 2 shirts'. Inline
Given linkedlist of moves of 2 players on tic tac toe , find who won
Given pile of 9 objects , Pick 1,2,or 3. 2 Players , last one to pick is looser. Give winning strategy.
Given stream of integers , give me median at any time.
Construct BST from pre and inorder
Rod cutting problem
Deletion in bst
Implement using BST
How many bits need to change to convert one num to other?
Check MSB is 0/1 ?
T9 dictionary implement
23. Write code to find sum of digits
24. Write code to reverse an integer.
24. Write code to print first n numbers infibonacci series.
25. Write code to print nth fibonacci number.
25. Write code to add two numbers represented by a linked list.
26. Write code for bubble sort.
27. Implement radix sort.
28. Implement counting sort.
29. Implement insertion sort.
30. Implement selection sort.
31. Implement heap sort.
32. Implement bucket sort.
33. Write code to find first repeated character in a string.
34. Write code to find first unique character in a string.
How to find middle element of linkedlist in one pass?
Write code to remove duplicates from an array.
Implement BST.
Implement doubly linked list.
Implement doubly linked list using single pointer.
Write code to convert decimal to binary.
Write code to sort a map by value.
Write code to find common elements in two arrays.
Find longest substring without repeating characters.
Determine whether a point lies inside a triangle.
Nuts and bolts problem.
What is the probability that knight stays inside the chess board?
Implement stack using likedlist.
Implement queue using linkedlist.
Check for balanced paranthesis in an expression.
Sort an array containing only 0 and 1.
Sort a linkedlist containing 0,1,2.
Minimum number of platforms required at railway station.
convert word to another , one time one character , from a list of words.
Break string into dictionary words.
Find seed of a number. A number X is seed of Y if multiplying X by it's digits equates to Y.
Finds pairs of numbers with difference k from an unsorted array.
Find number of trailing zeros in a number factorial.
Given an array containing 0 and 1 , find the largest subarray cotaining equal number of 0 and 1.
Sort an array of elements by decreasing order of frequency.
Given an array of words , group all anagrams in set
Find the min element in a sorted rotated array.
Delete all leaves from a binary tree.
Find two elements in an array whose sum is closest to zero.
Given two rectangles if they overlap or not (Imp)Find max sub square submatrix in a 2d matrix of 0 and 1 with all 1.
Minimum coin problem
Rotate an array by k
Find the level of a given node in a binary tree
Implement heap sort
Implement priority queue.
Find difference in the sum of nodes at odd level and nodes at even level of a binary tree.
Check for children sum property of a binary tree.
Inorder predecessor in a binary tree
Inorder successor in a binary tree.
Rotate linked list by k nodes
Sort an array of 0,1,2.
Find pair of elements in an array whose sum is equal to given number.
Check whether two strings are anagram.
Given a linked list , each node has two pointers , one point to next , another to some random node , How to copy it ?
Get intersection point of two linked lists. (imp)
count nodes in a tree
determine if two binary trees are identical?
Implement binary search algorithm(imp)
sort an almost sorted array with two elements swapped
merge two sorted array without using extra space , assuming first array has enough space
Find minimum distance between two elements in an array
Print all the leaders in an array.
Given a 2d matrix m of 0 and 1 , if m[i][j] is 1 , fill row i and col j with 1
Replac each element of an array with next greatest element.
Find row with max 1 in sorted matrix
Find the number occuring odd number of times in an array , rest occur even number of times.
Given k sorted arrays of size n , merge them.
Find all pythogorean triplets in an array.
Convert sorted array to balanced BST.
Find LIS contigous.
Find LIS non contigous.
Find sub array whose sum equals given number.
Find max diff. between two elements in an array such that larger appears after smaller.
Find majority(occurs more than half) element in an array in O(n).
Even numbers at even pos , odd at odd in an array
Find union and intersection of two arrays.
Find smallest positive number missing from an array.
Shift zeros to end of array
Reverse linkedlist in group of k
Remove spaces from a sentence.
Reverse each word of a sentence
multiply two numbers using min. number of additions
detect cycle in graph
print bottom view of binary tree
print top view of binary treeadd two integers without using +
randomized quick sort
In a 2d matrix , a sub square matrix is painted , find minimal/optimal cost of painting the rest using a fixed block. which block to use ?
Floyd WarshallA 2d matrix containing 0,1,2 , 0 -> empty orange , 1-> fresh orange , 2-> rotten orange , how much time so that all are rotten , a rotten orane will rot adjacent (not diagonal) in one time frame.
Given a binary tree, n and k , find sum of all nodes which are k nodes away from node n.
mirror a binary tree
check if two binary trees are mirror
Convert BST to DLL.
check binary tree is bst
convert sentence like 'these are twelve pens and two shirts. convert it to 'these are 12 pens and 2 shirts'. Inline
Given linkedlist of moves of 2 players on tic tac toe , find who won
Given pile of 9 objects , Pick 1,2,or 3. 2 Players , last one to pick is looser. Give winning strategy.
Given stream of integers , give me median at any time.
Construct BST from pre and inorder
Rod cutting problem
Deletion in bst
Implement using BST
How many bits need to change to convert one num to other?
Check MSB is 0/1 ?
T9 dictionary implement
Java
1. What is OOPS ?
2. How hashmap works in Java ? Difference between hashmap and hashtable ? What will happen if I put a key which already exists in hashmap ?
3. What is an interface ? Difference between interface and abstract class ? When to use which ?
4. Overloading vs overriding ?
5. Why string is immutable ?
6. What is difference between arraylist and linkedlist ?
7. What is difference between JDK, JRE and JVM ?
8. Why use getters and setters ?
9. Does Java support multiple inheritance ? Why or why not ?
10. What are the types of Exceptions ? How are they different ? What are the best practices for exceptions ?
11. Can we override private , static methods ?
12. What is generics , why use generics ?
13. Why can't we use polymorphism in generics ?
14. What is a thread ? What is a process ? What's the difference ?
15. What is final keyword ? How it's used in java ?
16. What's the importance of serializableversionid ?
17. What if I put return in try block , catch block and finally block ? In which scenario finally is not executed ?
18. What is garbage collection ? How it's done ?
19. What is the use volatile , transient keywords ?
20. What is java memory model ?
21. String vs StringBuffer vs StringBuilder
22. What is thread safety ? What is race condition? What is deadlock ? What are the conditions for deadlock ? Give an example of deadlock. How to prevent deadlock ? What is livelock? Example?
23. Semaphore vs mutex vs lock vs synchronized
24. What is classloader ? Types? How classloader works ?
25. What is JVM? How does it works?
26. Can I overload main method?
27. What is ThreadLocal class? Why use it?
28. Wait vs sleep vs yield?
29. Is java compiled language or interpreted language?
30. Executor.submit vs Executor.execute?
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Is java platform independent ? How ?
static class vs singleton
thread lifecycle
.throw vs throws?
Error vs exception?
What are marker interfaces? Examples?
1. What is OOPS ?
2. How hashmap works in Java ? Difference between hashmap and hashtable ? What will happen if I put a key which already exists in hashmap ?
3. What is an interface ? Difference between interface and abstract class ? When to use which ?
4. Overloading vs overriding ?
5. Why string is immutable ?
6. What is difference between arraylist and linkedlist ?
7. What is difference between JDK, JRE and JVM ?
8. Why use getters and setters ?
9. Does Java support multiple inheritance ? Why or why not ?
10. What are the types of Exceptions ? How are they different ? What are the best practices for exceptions ?
11. Can we override private , static methods ?
12. What is generics , why use generics ?
13. Why can't we use polymorphism in generics ?
14. What is a thread ? What is a process ? What's the difference ?
15. What is final keyword ? How it's used in java ?
16. What's the importance of serializableversionid ?
17. What if I put return in try block , catch block and finally block ? In which scenario finally is not executed ?
18. What is garbage collection ? How it's done ?
19. What is the use volatile , transient keywords ?
20. What is java memory model ?
21. String vs StringBuffer vs StringBuilder
22. What is thread safety ? What is race condition? What is deadlock ? What are the conditions for deadlock ? Give an example of deadlock. How to prevent deadlock ? What is livelock? Example?
23. Semaphore vs mutex vs lock vs synchronized
24. What is classloader ? Types? How classloader works ?
25. What is JVM? How does it works?
26. Can I overload main method?
27. What is ThreadLocal class? Why use it?
28. Wait vs sleep vs yield?
29. Is java compiled language or interpreted language?
30. Executor.submit vs Executor.execute?
*****************
Is java platform independent ? How ?
static class vs singleton
thread lifecycle
.throw vs throws?
Error vs exception?
What are marker interfaces? Examples?
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26. Difference between string created as new and as literal
what is composition, aggregation and association ?
composition vs inheritance?
26. Difference between string created as new and as literal
what is composition, aggregation and association ?
composition vs inheritance?
How to iterate over hashmap key values ?
What if I return a constant value from hashcode method?
What are the rules of overriding ?
IF a method throws FileNotFoundException in super , can the same method in subclass throws IOException
IF a method throws NullPointerException in super , can the same method in subclass throws ArrayStoreException
Can any class be added to treemap ?
Can you access non static variable in static context?Why or why not ?
23. What is the base class of all exceptions ?
What if I return a constant value from hashcode method?
What are the rules of overriding ?
IF a method throws FileNotFoundException in super , can the same method in subclass throws IOException
IF a method throws NullPointerException in super , can the same method in subclass throws ArrayStoreException
Can any class be added to treemap ?
Can you access non static variable in static context?Why or why not ?
23. What is the base class of all exceptions ?
What is bytecode ?
What's the size of character in java ? Why ?
What's the size of character in java ? Why ?
What is JIT ?
How is java secure language?
What are the features of Java language ?
Is java strongly typed ?
How is java secure language?
What are the features of Java language ?
Is java strongly typed ?
How java compiler compiles a java program? What about dependencies?
What should be the file name of java?
Can I write a different filename than class name?
Is empty java source file valid?
Can I print something from a program not having main method?
Why main method is static?
I have two methods of same name , one accepts string , other object , I pass argument as null , which one will be called?
same question , for string and stringbuffer
what if I declare getter , setter without declaring variable?
What should be the file name of java?
Can I write a different filename than class name?
Is empty java source file valid?
Can I print something from a program not having main method?
Why main method is static?
I have two methods of same name , one accepts string , other object , I pass argument as null , which one will be called?
same question , for string and stringbuffer
what if I declare getter , setter without declaring variable?
Is javascript part of java ?
what is constructor?
constructor vs method
is constructor inherited?
can constructor be overloaded?
can constructor be overriden?
does java provides copy constructor?
what is the first statement of any constructor?
Explain how memory is allocated by JVM?
How is java WORA ?
what is the difference between static method and non static method?
what is constructor?
constructor vs method
is constructor inherited?
can constructor be overloaded?
can constructor be overriden?
does java provides copy constructor?
what is the first statement of any constructor?
Explain how memory is allocated by JVM?
How is java WORA ?
what is the difference between static method and non static method?
Does java support pointers? Why or why not?
How to create a virtual function in java?
Is it necessary to initialize final variable?
Can you declare main method as final?
what is static binding and dynamic binding? Difference?
what is compile time binding and runtime binding?
what is abstraction?
what is encapsulation?
abstraction vs encapsulation?
Give real life examples of abstraction,encapsulation,inheritance.
can a class be abstract and final?
is goto a keyword in java?
is const a keyword in java?
can an interface be final?
can we declare variables in interface?
How to create a virtual function in java?
Is it necessary to initialize final variable?
Can you declare main method as final?
what is static binding and dynamic binding? Difference?
what is compile time binding and runtime binding?
what is abstraction?
what is encapsulation?
abstraction vs encapsulation?
Give real life examples of abstraction,encapsulation,inheritance.
can a class be abstract and final?
is goto a keyword in java?
is const a keyword in java?
can an interface be final?
can we declare variables in interface?
Can we mark constructor as protected? What will it mean?
What are packages? What are two strategies to group classes in packages?
What is the first line in any class?
What is the order of execution in a class?
What if I import same class twice?
Should I import as java.util.* or java.util.<some class>? Difference?
What is static import?
Which package is imported by default?
What are packages? What are two strategies to group classes in packages?
What is the first line in any class?
What is the order of execution in a class?
What if I import same class twice?
Should I import as java.util.* or java.util.<some class>? Difference?
What is static import?
Which package is imported by default?
Base class for error and exception?
What is exception propagation?
Can an exception be rethrown?
Can a subclass overriding method throw an exception not thrown by superlcass method?
What is intern method?
iteration vs enumeration
Can an exception be rethrown?
Can a subclass overriding method throw an exception not thrown by superlcass method?
What is intern method?
iteration vs enumeration
can we overload static methods in java
why constructor be final,static,abstract
why constructor be final,static,abstract
Multithreading
1. What is a thread ? What is a process ? What's the difference ?
2. How to create a thread ? Which way do you prefer ? What's the difference between runnable and callable ?
3.multithreading best practices
4. What is volatile keyword ?
5. What is thread safety ? What is race condition? What is deadlock ? What are the conditions for deadlock ? Give an example of deadlock. How to prevent deadlock ? What is livelock ?
6. Semaphore vs mutex vs lock vs synchronized
7. Why wait , notify , notifyAll are declared in Object class ? Why wait and notify should be called from synchronized block ? notify vs notifyAll
8. How to create immutable objects in java ?
9. sleep vs wait vs yeild
10. Write code to solve producer consumer problem.
11.write thread safe singleton
12. how threads are scheduled in java?
13. countdownlatch vs cyclicbarrier
14. How to stop a thread ?
15. what is thread pool ? How to use , why to use ?
16. threadlocal
17. submit vs execute in thread pool
18. readwritelock
19. reentrant lock
20. fork join framework
21. how to ensure sequence in multiple threads
22. start vs run
23. What is Java memory model ?
24. what is thread group ? Should we use it ?
25. green thread , native thread
whole method synchronized vs critical section synchronized ?
1. What is a thread ? What is a process ? What's the difference ?
2. How to create a thread ? Which way do you prefer ? What's the difference between runnable and callable ?
3.multithreading best practices
4. What is volatile keyword ?
5. What is thread safety ? What is race condition? What is deadlock ? What are the conditions for deadlock ? Give an example of deadlock. How to prevent deadlock ? What is livelock ?
6. Semaphore vs mutex vs lock vs synchronized
7. Why wait , notify , notifyAll are declared in Object class ? Why wait and notify should be called from synchronized block ? notify vs notifyAll
8. How to create immutable objects in java ?
9. sleep vs wait vs yeild
10. Write code to solve producer consumer problem.
11.write thread safe singleton
12. how threads are scheduled in java?
13. countdownlatch vs cyclicbarrier
14. How to stop a thread ?
15. what is thread pool ? How to use , why to use ?
16. threadlocal
17. submit vs execute in thread pool
18. readwritelock
19. reentrant lock
20. fork join framework
21. how to ensure sequence in multiple threads
22. start vs run
23. What is Java memory model ?
24. what is thread group ? Should we use it ?
25. green thread , native thread
whole method synchronized vs critical section synchronized ?
Java Collections:
1. What is a collection ? What is collections framework ? What are the benefits ?
2. What is the difference between collection , Collection and Collections ?
3. What are the importatnt interfaces of collections framework? Draw the diagram for collections framework heirarchy.
4. What is the difference between ArrayList and Vector ?
5. How hashmap , hashset and treemap works ? What is the difference between HashMap , Hashtable , concurrenthashmap?
6. What is the difference between ordered and sorted ? Which two interfaces are used for providing sorting order ?
7. Why map is not part of collections framework ?
8. What Collection doesn't implement Serializable and Cloneable interface ?
9. What is the difference between fail fast and fail safe iterator ?
10. What is copyonwritearraylist and why it is used ?
1. What is a collection ? What is collections framework ? What are the benefits ?
2. What is the difference between collection , Collection and Collections ?
3. What are the importatnt interfaces of collections framework? Draw the diagram for collections framework heirarchy.
4. What is the difference between ArrayList and Vector ?
5. How hashmap , hashset and treemap works ? What is the difference between HashMap , Hashtable , concurrenthashmap?
6. What is the difference between ordered and sorted ? Which two interfaces are used for providing sorting order ?
7. Why map is not part of collections framework ?
8. What Collection doesn't implement Serializable and Cloneable interface ?
9. What is the difference between fail fast and fail safe iterator ?
10. What is copyonwritearraylist and why it is used ?
Spring
1. What is spring ? Why use spring ?
2. What is IoC ? What is DI ? Types of DI ? When to use which ?
3. What are the modules in spring ?
4. What is AOP ? Why use it ?
5. What is spring MVC ?
6. What is lifecycle of bean ?
7. What is beanfactory and application context ? Differences ?
8. What are scopes of bean in spring ? Differences ?
9. Which design patters are used in spring ?
10. What are the new features in spring 4 ?
11. What is bean auto wiring? What are different types of doing that?
12. How will you resolve circular dependency in spring?
13. What is aspect, joinpoint, pointcut, advice, introduction, target?
14. What is weaving? Types?
15. how to integrate hibernate with spring ?
16. What is spring mvc? How to setup spring mvc?
17. how to develop rest web services in spring?
18. What are best practices in spring?
19. What is the difference between n-tier and MVC?
20. How is transaction management done in spring? Types? Prefer?
1. What is spring ? Why use spring ?
2. What is IoC ? What is DI ? Types of DI ? When to use which ?
3. What are the modules in spring ?
4. What is AOP ? Why use it ?
5. What is spring MVC ?
6. What is lifecycle of bean ?
7. What is beanfactory and application context ? Differences ?
8. What are scopes of bean in spring ? Differences ?
9. Which design patters are used in spring ?
10. What are the new features in spring 4 ?
11. What is bean auto wiring? What are different types of doing that?
12. How will you resolve circular dependency in spring?
13. What is aspect, joinpoint, pointcut, advice, introduction, target?
14. What is weaving? Types?
15. how to integrate hibernate with spring ?
16. What is spring mvc? How to setup spring mvc?
17. how to develop rest web services in spring?
18. What are best practices in spring?
19. What is the difference between n-tier and MVC?
20. How is transaction management done in spring? Types? Prefer?
Difference between @Component, @Repository, @Service ?
15. What is dispatcher servlet?
16. types of IOC container in spring ? Differences ?
17.
18. how spring simplifies jdbc ?
19.
20.
21. different jdbc template ? purpose ?
22. spring aop vs aspectJ aop ?
23. does spring framework supports all join points ?
24. what is front controller class in spring mvc
25. @Controller
26. @RequestMapping
27. @PathVariable
28. ViewResolver ? Types ?
29.
30. How validation in spring ?
31. Benefits of spring tool suite ?
32. What is spring bean ?
33. Bean life cycle ?
33. Different ways of configuring spring bean ?
34.
35. what is context loader listener ?
36. what is multipart resolver and when it's used ?
37. how to handle exceptions in spring , spring mvc , sprin jdbc , etc?
38. does spring bean provide thread safety ?
39. can we have multiple spring configuration files ?
40. what is spring mvc interceptor ?
41. what is spring security ?
42. how to inject properties ?
43. how to use collections in spring ?
44.
45. design patterns used in spring ?
46. what is spring xml based configuration and java based configuration and annotation based? difference ? which one you prefer and use ? (redefine it)
47. are singleton beans thread safe ?
48. Explain @Autowired
49. Explain @Qualifier
50. Explain @Inject
51. Explain @Required
52. DIfferent types of events in spring ?
53. Difference between FileSystemResource , ClassPathREsource
54. What are different implementation/types of ApplicationContext ?
17.
18. how spring simplifies jdbc ?
19.
20.
21. different jdbc template ? purpose ?
22. spring aop vs aspectJ aop ?
23. does spring framework supports all join points ?
24. what is front controller class in spring mvc
25. @Controller
26. @RequestMapping
27. @PathVariable
28. ViewResolver ? Types ?
29.
30. How validation in spring ?
31. Benefits of spring tool suite ?
32. What is spring bean ?
33. Bean life cycle ?
33. Different ways of configuring spring bean ?
34.
35. what is context loader listener ?
36. what is multipart resolver and when it's used ?
37. how to handle exceptions in spring , spring mvc , sprin jdbc , etc?
38. does spring bean provide thread safety ?
39. can we have multiple spring configuration files ?
40. what is spring mvc interceptor ?
41. what is spring security ?
42. how to inject properties ?
43. how to use collections in spring ?
44.
45. design patterns used in spring ?
46. what is spring xml based configuration and java based configuration and annotation based? difference ? which one you prefer and use ? (redefine it)
47. are singleton beans thread safe ?
48. Explain @Autowired
49. Explain @Qualifier
50. Explain @Inject
51. Explain @Required
52. DIfferent types of events in spring ?
53. Difference between FileSystemResource , ClassPathREsource
54. What are different implementation/types of ApplicationContext ?
57. what are inner beans ?
58. what are limitations in autowiring ?
59. how to turn on annotation wiring ?
60. what is spring dao ? (??)
61. spring aop target object ?
58. what are limitations in autowiring ?
59. how to turn on annotation wiring ?
60. what is spring dao ? (??)
61. spring aop target object ?
Hibernate
1. What is hibernate? Why use it? Benefits over JDBC?
2. How to set up hibernate?
3. What is mapping, one to one, etc and how to do it?
4. How inheritance is handled?
5. What is the difference between transient, persistent and detached objects?
6. Explain hibernate cache.
7. What is session,sessionFactory? Are they threadsafe?
8. How transaction management is done in hibernate ?
9. What's the architecture of hibernate?
10. HQL vs SQL?
11. Difference between get and load in hibernate ?
12. Why it's important to provide no argument constructor ?
13. What is the difference between save, persists, saveOrUpdate ?
14. What is named SQL query ?
13. What is the difference between session's lock and update method?
14. Explain second level cache in detail.
15. What is query cache in hibernate?
What is criteria API? Pros and cons?
16. Can we make a hibernate class entity final?
17. What is ORM? What's the use? Examples?
18. How to create sessionFactory?
19. What are POJOs , what's their significance?
20. How to invoke stored procedure in hibernate?
21. What are the types of collections in hibernte?
22. What are the four ORM levels in hibernate?
23. How primary key is created in hibernate?
24. How can we reattach any detach objects in hibernate?
25. What are different fetching strategies of hibernate?
26. How database table is mapped with java object?
27. What is the use of version property in hibernate?
28. Does hibernate supports polymorphism?
29.
1. What is hibernate? Why use it? Benefits over JDBC?
2. How to set up hibernate?
3. What is mapping, one to one, etc and how to do it?
4. How inheritance is handled?
5. What is the difference between transient, persistent and detached objects?
6. Explain hibernate cache.
7. What is session,sessionFactory? Are they threadsafe?
8. How transaction management is done in hibernate ?
9. What's the architecture of hibernate?
10. HQL vs SQL?
11. Difference between get and load in hibernate ?
12. Why it's important to provide no argument constructor ?
13. What is the difference between save, persists, saveOrUpdate ?
14. What is named SQL query ?
13. What is the difference between session's lock and update method?
14. Explain second level cache in detail.
15. What is query cache in hibernate?
What is criteria API? Pros and cons?
16. Can we make a hibernate class entity final?
17. What is ORM? What's the use? Examples?
18. How to create sessionFactory?
19. What are POJOs , what's their significance?
20. How to invoke stored procedure in hibernate?
21. What are the types of collections in hibernte?
22. What are the four ORM levels in hibernate?
23. How primary key is created in hibernate?
24. How can we reattach any detach objects in hibernate?
25. What are different fetching strategies of hibernate?
26. How database table is mapped with java object?
27. What is the use of version property in hibernate?
28. Does hibernate supports polymorphism?
29.
Design Patterns
1. Which design patterns have you used ?
2. What is the difference between factory , abstract factory and builder ?
3. Write code for singleton , observer ?
4. Difference between strategy and state ?
5. What are the best coding practices in Java ?
6. Design ATM , parking lot , wallet , ecommerce.
7. Question on one of the following , singleton , factory , abstract factory , builder , prototype , observer , facade , decorator, dao. Give real life example of these.
8. Code to solve producer consumer problem.
9. What is MVC and n tier ? Why use it ? Difference
10.What are the types of patterns? Differences ?
Design Chess
1. Which design patterns have you used ?
2. What is the difference between factory , abstract factory and builder ?
3. Write code for singleton , observer ?
4. Difference between strategy and state ?
5. What are the best coding practices in Java ?
6. Design ATM , parking lot , wallet , ecommerce.
7. Question on one of the following , singleton , factory , abstract factory , builder , prototype , observer , facade , decorator, dao. Give real life example of these.
8. Code to solve producer consumer problem.
9. What is MVC and n tier ? Why use it ? Difference
10.What are the types of patterns? Differences ?
Design Chess
SQL
1. What is difference between delete and truncate ?
2. What are different types of join ?
3. A question on join , especially self join such as , How to find all employees who are also manager ?
4. How to find second highest salary ?
5. What are indexes ? Types ? Difference ? Why use index ? Pros and cons ?
6. What is primary key , foreign key , unique key , candidate key ? Differences ?
7. What is normalization ? Types ? How to achieve ? What is denormalization ?
8. What is view ? Why use it ?
9. What are types of query (correlated , subquery) ?
10. What are constraints , different type of constraint , when to use which ?
ACID?
1. What is difference between delete and truncate ?
2. What are different types of join ?
3. A question on join , especially self join such as , How to find all employees who are also manager ?
4. How to find second highest salary ?
5. What are indexes ? Types ? Difference ? Why use index ? Pros and cons ?
6. What is primary key , foreign key , unique key , candidate key ? Differences ?
7. What is normalization ? Types ? How to achieve ? What is denormalization ?
8. What is view ? Why use it ?
9. What are types of query (correlated , subquery) ?
10. What are constraints , different type of constraint , when to use which ?
ACID?
Web Services
1. What are web services ? Why use them ?
1. What is service oriented architecture ? Benefits ?
2. What is REST ? Why use it ? What is a resource ?
3. Difference between rest and soap ? When to use which ?
4. Difference between get and post ? Difference between put and post ?
5.What happens if RestFull resources are accessed by multiple clients ? Do you need to make it thread-safe?
Client server technology
1. What is service oriented architecture ? Benefits ?
2. What is REST ? Why use it ? What is a resource ?
3. Difference between rest and soap ? When to use which ?
4. Difference between get and post ? Difference between put and post ?
5.What happens if RestFull resources are accessed by multiple clients ? Do you need to make it thread-safe?
Client server technology
Servlet , JSP
1. What is a servlet ? What are it's advantages ?
2. What is the difference between web server and application server ?
3. How many instances of a servlet are created? Are servlet thread safe?
4. What is the difference between servletcontext and servletconfig object ?
5. How can we create deadlock in servlet ?
6. How to do session management ?
7. What is the life cycle of a servlet ?
8. What is the difference between URL encoding and URL rewriting ?
9. How does cookies work ?
10. What is the difference between get and post ?
1. What is a servlet ? What are it's advantages ?
2. What is the difference between web server and application server ?
3. How many instances of a servlet are created? Are servlet thread safe?
4. What is the difference between servletcontext and servletconfig object ?
5. How can we create deadlock in servlet ?
6. How to do session management ?
7. What is the life cycle of a servlet ?
8. What is the difference between URL encoding and URL rewriting ?
9. How does cookies work ?
10. What is the difference between get and post ?
OS:
1. What is the difference between a process and a thread ?
2. What is a semaphore , mutex , lock ? Differences ?
3. What is virtual memory ?
4. What is paging ? What is segmentation fault ?
5. What is banker's algorithm ?
6. When does thrasing occurs ?
7. What is deadlock ? What are the conditions for it ? How to prevent it ?
8. What are the types of scheduler ?
9. What is belady's anomaly ?
10. What is dining philosopher problem and solution ?
How ftp works
Linux:
Grep
1. What is the difference between a process and a thread ?
2. What is a semaphore , mutex , lock ? Differences ?
3. What is virtual memory ?
4. What is paging ? What is segmentation fault ?
5. What is banker's algorithm ?
6. When does thrasing occurs ?
7. What is deadlock ? What are the conditions for it ? How to prevent it ?
8. What are the types of scheduler ?
9. What is belady's anomaly ?
10. What is dining philosopher problem and solution ?
How ftp works
Linux:
Grep
Others
xml vs json
Networking
Networking
What is IP address?
What is MAC address?
What is MAC layer?
OSI?
TCP?
Network Address Translation?
DNS?
Checksum error correction
3 bit parity
What is MAC address?
What is MAC layer?
OSI?
TCP?
Network Address Translation?
DNS?
Checksum error correction
3 bit parity
HTML , Javascript , CSS , Web
What is HTML5 ?
What is jquery ? Why use it ?
What is the difference bewtween '==' and '===' ?
What is CSS ? Advantages ?
What is css box model ?
What is ajax ? Why and how to use it?
What is closure ? Give example?
Can you access cookie using javascript ?
How to redirect url using javascript ?
What is the use of void(0) ?
What is HTML5 ?
What is jquery ? Why use it ?
What is the difference bewtween '==' and '===' ?
What is CSS ? Advantages ?
What is css box model ?
What is ajax ? Why and how to use it?
What is closure ? Give example?
Can you access cookie using javascript ?
How to redirect url using javascript ?
What is the use of void(0) ?
Puzzles100 floors and 2 eggs
Hats on three men , in a line , tell color
Rickety bridge , 1,2,7,10 min , one lantern , max two people on bridge
switches outside a room , how to find which one is for bulb
2 candles each burn in 30 min , how to measure 45 min
Ants are moving from corners of equilateral traingle. Probability won't collide ?
Camel and banana
100 doors , flipped as you pass
5 pirates , 100 gold coin , strategy
country people want only boy , ratio of boys to girls
100 trucks , 1000 mile...
50 red marbles , 50 blue marbles , 2 jars , one jar selected , one marble selected , maxiimize prob. of red marble
How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?
A duck that is being chased by a fox saves itself by sitting at the center of circular pond of radius r. The duck can fly from land but cannot fly from the water. Furthermore, the fox cannot swim. The fox is four times faster than the duck. Assuming that the duck and fox are perfectly smart, is it possible for the duck to ever reach the edge of the pond and fly away to its escape from the ground?
Hats on three men , in a line , tell color
Rickety bridge , 1,2,7,10 min , one lantern , max two people on bridge
switches outside a room , how to find which one is for bulb
2 candles each burn in 30 min , how to measure 45 min
Ants are moving from corners of equilateral traingle. Probability won't collide ?
Camel and banana
100 doors , flipped as you pass
5 pirates , 100 gold coin , strategy
country people want only boy , ratio of boys to girls
100 trucks , 1000 mile...
50 red marbles , 50 blue marbles , 2 jars , one jar selected , one marble selected , maxiimize prob. of red marble
How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?
A duck that is being chased by a fox saves itself by sitting at the center of circular pond of radius r. The duck can fly from land but cannot fly from the water. Furthermore, the fox cannot swim. The fox is four times faster than the duck. Assuming that the duck and fox are perfectly smart, is it possible for the duck to ever reach the edge of the pond and fly away to its escape from the ground?
There are n houses in a row , we have to paint them in R,G,B , no two house can have same clor , each paint has cost associated , find min cost
Gold bar puzzle
25 Horses puzzle
Max number on sphere which are equidistant?
How many points can be equidistant to each other?
Gold bar puzzle
25 Horses puzzle
Max number on sphere which are equidistant?
How many points can be equidistant to each other?
HR
Tell me abt yourself
Why <this company>?
Your weaknesses?
5 years?
Any question?
Why to hire you?
Why <this company>?
Your weaknesses?
5 years?
Any question?
Why to hire you?
General
Trending Technologies
****************Top 10******************************8
Trending Technologies
****************Top 10******************************8
Solve each problem in every possible way.
Top 20 DS , Algo ,Coding , Bit Magic
1. Write code to find loop in linkedlist , reverse a linkedlist , is Palindrome
2. Find LCA in a binary tree.
3. Do DFS ,BFS,inorder , preorder ,postorder ,zigzag in tree. (recursive +iterative)
4. A question on sorting among bubble , quick , merge
5. How to find middle element or kth element from end in a linked list ?
6. In an integer array, there is 1 to 100 number, out of one is duplicate, how to find ?
7. Write code to reverse a string without using any API.
8. Write a program to find diameter , height of tree.
9. How will you implement a dictionary ?
10. Implement LRU.
11. Djikstra , prim
12. Find number of set bits.
13. Check number is power of 2.
14. How to search in rotated array ?
15. Search in a sorted 2d matrix.
16. Print 2d matrix in spiral
17. Find kth largest element in array
18. Implement stack using queue , queue using stack , two stack using an array.
19. Check string/integer is palindrome.
20. A DP problem , such as find maximum subarray , longest palindrome substring , best time to buy sell stock
1. Write code to find loop in linkedlist , reverse a linkedlist , is Palindrome
2. Find LCA in a binary tree.
3. Do DFS ,BFS,inorder , preorder ,postorder ,zigzag in tree. (recursive +iterative)
4. A question on sorting among bubble , quick , merge
5. How to find middle element or kth element from end in a linked list ?
6. In an integer array, there is 1 to 100 number, out of one is duplicate, how to find ?
7. Write code to reverse a string without using any API.
8. Write a program to find diameter , height of tree.
9. How will you implement a dictionary ?
10. Implement LRU.
11. Djikstra , prim
12. Find number of set bits.
13. Check number is power of 2.
14. How to search in rotated array ?
15. Search in a sorted 2d matrix.
16. Print 2d matrix in spiral
17. Find kth largest element in array
18. Implement stack using queue , queue using stack , two stack using an array.
19. Check string/integer is palindrome.
20. A DP problem , such as find maximum subarray , longest palindrome substring , best time to buy sell stock
Top 10 Java
1. What is OOPS ?
2. How hashmap works in Java ? Difference between hashmap and hashtable ? What will happen if I put a key which already exists in hashmap ?
3. What is an interface ? Difference between interface and abstract class ? When to use which ?
4. Overloading vs overriding ?
5. Why string is immutable ?
6. What is difference between arraylist and linkedlist ?
7. What is difference between JDK, JRE and JVM ?
8. Why use getters and setters ?
9. Does Java support multiple inheritance ?
10. What are the types of Exceptions ? How are they different ?
1. What is OOPS ?
2. How hashmap works in Java ? Difference between hashmap and hashtable ? What will happen if I put a key which already exists in hashmap ?
3. What is an interface ? Difference between interface and abstract class ? When to use which ?
4. Overloading vs overriding ?
5. Why string is immutable ?
6. What is difference between arraylist and linkedlist ?
7. What is difference between JDK, JRE and JVM ?
8. Why use getters and setters ?
9. Does Java support multiple inheritance ?
10. What are the types of Exceptions ? How are they different ?
Top 10 Multithreading
1. What is a thread ? What is a process ? What's the difference ?
2. How to create a thread ? Which way do you prefer ? What's the difference between runnable and callable ?
3.multithreading best practices
4. What is volatile keyword ?
5. What is thread safety ? What is race condition? What is deadlock ? What are the conditions for deadlock ? Give an example of deadlock. How to prevent deadlock ? What is livelock ?
6. Semaphore vs mutex vs lock vs synchronized
7. Why wait , notify , notifyAll are declared in Object class ? Why wait and notify should be called from synchronized block ? notify vs notifyAll ?
8. How to create immutable objects in java ?
9. sleep vs wait vs yield
10. Write code to solve producer consumer problem.
1. What is a thread ? What is a process ? What's the difference ?
2. How to create a thread ? Which way do you prefer ? What's the difference between runnable and callable ?
3.multithreading best practices
4. What is volatile keyword ?
5. What is thread safety ? What is race condition? What is deadlock ? What are the conditions for deadlock ? Give an example of deadlock. How to prevent deadlock ? What is livelock ?
6. Semaphore vs mutex vs lock vs synchronized
7. Why wait , notify , notifyAll are declared in Object class ? Why wait and notify should be called from synchronized block ? notify vs notifyAll ?
8. How to create immutable objects in java ?
9. sleep vs wait vs yield
10. Write code to solve producer consumer problem.
Top 10 Collections
- What is a collection ? What is collections framework ? What are the benefits ?
- What is the difference between collection , Collection and Collections ?
- What are the importatnt interfaces of collections framework? Draw the diagram for collections framework heirarchy.
- What is the difference between ArrayList and Vector ?
- How hashmap , hashset and treemap works ? What is the difference between HashMap , Hashtable , concurrenthashmap?
- What is the difference between ordered and sorted ? Which two interfaces are used for providing sorting order ?
- Why map is not part of collections framework ?
- What Collection doesn't implement Serializable and Cloneable interface ?
- What is the difference between fail fast and fail safe iterator ?
- What is copyonwritearraylist and why it is used ?
Spring
1. What is spring ? Why use spring ?
2. What is IoC ? What is DI ? Types of DI ? When to use which ?
3. What are the modules in spring ?
4. What is AOP ? Why use it ?
5. What is spring MVC ?
6. What is lifecycle of bean ?
7. What is beanfactory and application context ? Differences ?
8. What are scopes of bean in spring ? Differences ?
9. Which design patters are used in spring ?
10. What are the new features in spring 4 ?
1. What is spring ? Why use spring ?
2. What is IoC ? What is DI ? Types of DI ? When to use which ?
3. What are the modules in spring ?
4. What is AOP ? Why use it ?
5. What is spring MVC ?
6. What is lifecycle of bean ?
7. What is beanfactory and application context ? Differences ?
8. What are scopes of bean in spring ? Differences ?
9. Which design patters are used in spring ?
10. What are the new features in spring 4 ?
Spring MVC
1. What is spring mvc ? Explain the architecture ?
1. What is spring mvc ? Explain the architecture ?
Hibernate
1. What is hibernate ? Why use it ? Benefits over JDBC ?
2. How to set up hibernate ?
3. Difference between get and load in hibernate ?
4. What is session , sessionFactory? Are they threadsafe?
5. What is the difference between transient , persistent and detached objects ?
6. Explain hibernate cache.
7. Why it's important to provide no argument constructor ?
8. What is mapping , one to one , etc and how to do it ?
9. How inheritance is handled ?
10. How transaction management is done in hibernate ?
1. What is hibernate ? Why use it ? Benefits over JDBC ?
2. How to set up hibernate ?
3. Difference between get and load in hibernate ?
4. What is session , sessionFactory? Are they threadsafe?
5. What is the difference between transient , persistent and detached objects ?
6. Explain hibernate cache.
7. Why it's important to provide no argument constructor ?
8. What is mapping , one to one , etc and how to do it ?
9. How inheritance is handled ?
10. How transaction management is done in hibernate ?
Design Patterns
1. Which design patterns have you used ?
2. What is the difference between factory , abstract factory and builder ?
3. Write code for singleton , observer ?
4. Difference between strategy and state ?
5. What are the best coding practices in Java ?
6. Design ATM , parking lot , wallet , ecommerce.
7. Question on one of the following , singleton , factory , abstract factory , builder , prototype , observer , facade , decorator, dao. Give real life example of these.
8. Code to solve producer consumer problem.
9. What is MVC and n tier ? Why use it ? Difference
10.What are the types of patterns? Differences ?
1. Which design patterns have you used ?
2. What is the difference between factory , abstract factory and builder ?
3. Write code for singleton , observer ?
4. Difference between strategy and state ?
5. What are the best coding practices in Java ?
6. Design ATM , parking lot , wallet , ecommerce.
7. Question on one of the following , singleton , factory , abstract factory , builder , prototype , observer , facade , decorator, dao. Give real life example of these.
8. Code to solve producer consumer problem.
9. What is MVC and n tier ? Why use it ? Difference
10.What are the types of patterns? Differences ?
SQL
1. What is difference between delete and truncate ?
2. What are different types of join ?
3. A question on join , especially self join such as , How to find all employees who are also manager ?
4. How to find second highest salary ?
5. What are indexes ? Types ? Difference ? Why use index ? Pros and cons ?
6. What is primary key , foreign key , unique key , candidate key ? Differences ?
7. What is normalization ? Types ? How to achieve ? What is denormalization ?
8. What is view ? Why use it ?
9. What are types of query (correlated , subquery) ?
10. What are constraints , different type of constraint , when to use which ?
1. What is difference between delete and truncate ?
2. What are different types of join ?
3. A question on join , especially self join such as , How to find all employees who are also manager ?
4. How to find second highest salary ?
5. What are indexes ? Types ? Difference ? Why use index ? Pros and cons ?
6. What is primary key , foreign key , unique key , candidate key ? Differences ?
7. What is normalization ? Types ? How to achieve ? What is denormalization ?
8. What is view ? Why use it ?
9. What are types of query (correlated , subquery) ?
10. What are constraints , different type of constraint , when to use which ?
- What are web services ? Why use them ?
- What is service oriented architecture ? Benefits ?
- What is REST ? Characteristics ? Why use it ? What are the http methods supported by REST ? What is a resource ?
- Difference between rest and soap ? When to use which ?
- Difference between get and post ? Difference between put and post ?
- What happens if RestFull resources are accessed by multiple clients ? Do you need to make it thread-safe?
- How to use web services with spring ?
- What is URI ? URI vs URL ?
- What is statelessness ? Pros and cons ?
- What are the components of REST request and response ?
Servlet , JSP
1. What is a servlet ? What are it's advantages ?
2. What is the difference between web server and application server ?
3. How many instances of a servlet are created? Are servlet thread safe?
4. What is the difference between servletcontext and servletconfig object ?
5. How can we create deadlock in servlet ?
6. How to do session management ?
7. What is the life cycle of a servlet ?
8. What is the difference between URL encoding and URL rewriting ?
9. How does cookies work ?
10. What is the difference between get and post ?
1. What is a servlet ? What are it's advantages ?
2. What is the difference between web server and application server ?
3. How many instances of a servlet are created? Are servlet thread safe?
4. What is the difference between servletcontext and servletconfig object ?
5. How can we create deadlock in servlet ?
6. How to do session management ?
7. What is the life cycle of a servlet ?
8. What is the difference between URL encoding and URL rewriting ?
9. How does cookies work ?
10. What is the difference between get and post ?
OS:
1. What is the difference between a process and a thread ?
2. What is a semaphore , mutex , lock ? Differences ?
3. What is virtual memory ?
4. What is paging ? What is segmentation fault ?
5. What is banker's algorithm ?
6. When does thrasing occurs ?
7. What is deadlock ? What are the conditions for it ? How to prevent it ?
8. What are the types of scheduler ?
9. What is belady's anomaly ?
10. What is dining philosopher problem and solution ?
1. What is the difference between a process and a thread ?
2. What is a semaphore , mutex , lock ? Differences ?
3. What is virtual memory ?
4. What is paging ? What is segmentation fault ?
5. What is banker's algorithm ?
6. When does thrasing occurs ?
7. What is deadlock ? What are the conditions for it ? How to prevent it ?
8. What are the types of scheduler ?
9. What is belady's anomaly ?
10. What is dining philosopher problem and solution ?
HTML , Javascript , CSS , Web
- What is HTML5 ?
- What is jquery ? Why use it ?
- What is the difference bewtween '==' and '===' ?
- What is CSS ? Advantages ?
- What is css box model ?
- What is ajax ? Why and how to use it?
- What is closure ? Give example
- Can you access cookie using javascript ?
- How to redirect url using javascript ?
- What is the use of void(0) ?
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ANSWERS
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DS , Algo ,Coding , Bit Magic
1. Write code to find loop in linkedlist , reverse a linkedlist , is Palindrome
2. Find LCA in a binary tree.
3. Do DFS ,BFS,inorder , preorder ,postorder ,zigzag in tree. (recursive +iterative)
4. A question on sorting among bubble , quick , merge
5. How to find middle element or kth element from end in a linked list ?
6. In an integer array, there is 1 to 100 number, out of one is duplicate, how to find ?
7. Write code to reverse a string without using any API.
8. Write a program to find diameter , height of tree.
9. How will you implement a dictionary ?
10. Implement LRU.
11. Djikstra , prim
12. Find number of set bits.
13. Check number is power of 2.
14. How to search in rotated array ?
15. Search in a sorted 2d matrix.
16. Print 2d matrix in spiral
17. Find kth largest element in array
18. Implement stack using queue , queue using stack , two stack using an array.
19. Check string/integer is palindrome.
20. A DP problem , such as find maximum subarray , longest palindrome substring , best time to buy sell stock
ANSWERS
*******************************************************
DS , Algo ,Coding , Bit Magic
1. Write code to find loop in linkedlist , reverse a linkedlist , is Palindrome
2. Find LCA in a binary tree.
3. Do DFS ,BFS,inorder , preorder ,postorder ,zigzag in tree. (recursive +iterative)
4. A question on sorting among bubble , quick , merge
5. How to find middle element or kth element from end in a linked list ?
6. In an integer array, there is 1 to 100 number, out of one is duplicate, how to find ?
7. Write code to reverse a string without using any API.
8. Write a program to find diameter , height of tree.
9. How will you implement a dictionary ?
10. Implement LRU.
11. Djikstra , prim
12. Find number of set bits.
13. Check number is power of 2.
14. How to search in rotated array ?
15. Search in a sorted 2d matrix.
16. Print 2d matrix in spiral
17. Find kth largest element in array
18. Implement stack using queue , queue using stack , two stack using an array.
19. Check string/integer is palindrome.
20. A DP problem , such as find maximum subarray , longest palindrome substring , best time to buy sell stock
Spring
1. What is spring ? Why use spring ?
1. What is spring ? Why use spring ?
Spring is an IoC (Inversion of Control) framework and container. It uses DI(Dependency Injection) to instantiate objects. It provides option to integrate with a lots of other frameworks such as struts , hibernate , etc.
Spring provides many benefits :
a) It provides IoC container which leads to loose coupled code. Loosely coupled code has many benefits , it's easy to modify , easy to test.
b) It is very less intrusive and most of the functionalites can be achieved by just using POJOs.
c) Most of the functionalites are now can be achieved by using annotation which makes development very easy.
d) It provides easy integration to lot of other frameworks such as hibernate , redis , struts , etc.
e) It provides MVC support.
f) It provides better exception handling.
f) It provides templates which reduces a lot of boilerplate code.
2. What is IoC ? What is DI ? Types of DI ? When to use which ?
2. What is IoC ? What is DI ? Types of DI ? When to use which ?
IoC stands for Inversion of Control. It refers to the change in flow of program from code to some external entity such as xml. In this situation objects are instatiated by an external entity and then injected into the code thus creating loosely coupled code.
DI stands for Dependency Injection. It's a way to achieve inversion of control. In this , objects are injected by some external entity such as xml. There are two types of DI:
a)
3. What are the modules in spring ?
4. What is AOP ? Why use it ?
5. What is spring MVC ?
6. What is lifecycle of bean ?
7. What is beanfactory and application context ? Differences ?
8. What are scopes of bean in spring ? Differences ?
9. Which design patters are used in spring ?
10. What are the new features in spring 4 ?
3. What are the modules in spring ?
4. What is AOP ? Why use it ?
5. What is spring MVC ?
6. What is lifecycle of bean ?
7. What is beanfactory and application context ? Differences ?
8. What are scopes of bean in spring ? Differences ?
9. Which design patters are used in spring ?
10. What are the new features in spring 4 ?
Hibernate
1. What is hibernate ? Why use it ?
2. How to set up hibernate ?
3. Difference between get and load in hibernate ?
4. What is session , sessionFactory ? Are they threadsafe ?
5. What is the difference between transient , persistent and detached objects ?
6. Explain hibernate cache.
7. Why it's important to provide no argument constructor ?
8. What is mapping , one to one , etc and how to do it ?
9. How inheritance is handled ?
10.
1. What is hibernate ? Why use it ?
2. How to set up hibernate ?
3. Difference between get and load in hibernate ?
4. What is session , sessionFactory ? Are they threadsafe ?
5. What is the difference between transient , persistent and detached objects ?
6. Explain hibernate cache.
7. Why it's important to provide no argument constructor ?
8. What is mapping , one to one , etc and how to do it ?
9. How inheritance is handled ?
10.
Design Patterns
1. Which design patterns have you used ?
2. What is the difference between factory , abstract factory and builder ?
3. Write code for singleton , observer ?
4. Difference between strategy and state ?
5. What are the best coding practices in Java ?
6. Design ATM , parking lot , wallet , ecommerce.
7. Question on one of the following , singleton , factory , abstract factory , builder , prototype , observer , facade , decorator. Give real life example of these.
8. Code to solve producer consumer problem.
9. What is MVC and n tier ? Why use it ? Difference
10.
1. Which design patterns have you used ?
2. What is the difference between factory , abstract factory and builder ?
3. Write code for singleton , observer ?
4. Difference between strategy and state ?
5. What are the best coding practices in Java ?
6. Design ATM , parking lot , wallet , ecommerce.
7. Question on one of the following , singleton , factory , abstract factory , builder , prototype , observer , facade , decorator. Give real life example of these.
8. Code to solve producer consumer problem.
9. What is MVC and n tier ? Why use it ? Difference
10.
SQL
1. What is difference between delete and truncate ?
2. What are different types of join ?
3. A question on join , especially self join such as , How to find all employees who are also manager ?
4. How to find second highest salary ?
5. What are indexes ? Types ? Difference ? Why use index ? Pros and cons ?
6. What is primary key , foreign key , unique key , candidate key ? Differences ?
7. What is normalization ? Types ? How to achieve ? What is denormalization ?
8. What is view ? Why use it ?
9. What are types of query (correlated , subquery) ?
10. What are constraints , different type of constraint , when to use which ?
1. What is difference between delete and truncate ?
2. What are different types of join ?
3. A question on join , especially self join such as , How to find all employees who are also manager ?
4. How to find second highest salary ?
5. What are indexes ? Types ? Difference ? Why use index ? Pros and cons ?
6. What is primary key , foreign key , unique key , candidate key ? Differences ?
7. What is normalization ? Types ? How to achieve ? What is denormalization ?
8. What is view ? Why use it ?
9. What are types of query (correlated , subquery) ?
10. What are constraints , different type of constraint , when to use which ?
Web Services
1. What is service oriented architecture ? Benefits ?
2. What is REST ? Why use it ?
3. Difference between rest and soap ? When to use which ?
4. Difference between get and post ?
1. What is service oriented architecture ? Benefits ?
2. What is REST ? Why use it ?
3. Difference between rest and soap ? When to use which ?
4. Difference between get and post ?
Servlet , JSP
1.
1.
OS:
What is the difference between a process and a thread ?
What is a semaphore , mutex , lock ? Differences ?
What is the difference between a process and a thread ?
What is a semaphore , mutex , lock ? Differences ?
HTML , Javascript , CSS , Web
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