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Core Java Interview Questions
Questions Answers Views Company eMail

Implement a stack with push (), pop() and min() in O(1) time.

Amazon,

1118

Find the value of a specified element of the array arr[i] where 0 <= i <= n-1

Amazon,

988

Convert Binary tree to linked list.

Amazon,

1099

Convert a BST into a DLL and DLL to BST in place.

Amazon,

1116

worst case complexities of Quick sort and Merge sort.

Amazon,

1038

What do you mean by hashing?

Amazon,

1118

What is the definition of tree ?

Amazon,

1057

When can you say a graph to be a tree?

Amazon,

1088

What do you mean by constant time complexity?

Amazon,

1257

Write a program to show whether a graph is a tree or not using adjacency matrix.

Amazon,

1105

You're given a Boolean 2D matrix, can you find the number of islands?

Amazon,

1116

What steps are taken when the OS shifts from one-thread execution to another?

Amazon,

1371

What are the differences between graph and tree?

Amazon,

1128

Differentiate between overriding and overloading cases?

Amdocs,

1118

Differentiate between run time error and syntax error.

Amdocs,

1147

Post New Core Java Questions

Un-Answered Questions { Core Java }

Define canvas?

988

What are the different http methods?

1043

How do I get 64 bit java?

1125

FOR EXAMPLE WE R HAVING TWO LIST ELEMENTS ..BOTH LISTS CONTAINS ID,NAME,PLACE ..I NEED TO COMPARE BOTH IDS IN TWO LISTS,IF ID'S R SAME MEANS WE HAVE ADD THE DETAILS(LIKE NAME,PLACE) TO MAP...HOW IS POSSIBLE ?CAN ANY ONE SUGGEST?

3484

What is the format specifier?

950

How many bits is a string in java?

1035

What are advantages of using Java?s layout managers than windowing systems?

2375

What is byte data type?

1008

Can constructor be synchronized?

946

What is the declaration statement?

957

What is a map? What are the implementations of map?

1098

What is finally in Java?

1084

How do I convert a numeric ip address like 192.18.97.39 into a hostname like java.sun.com?

1018

what is function overloading in java?

1312

How will you calculate the depth of a binary tree if the tree contains 15 nodes?

1090

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