Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

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

Amazon,

1107

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

Amazon,

980

Convert Binary tree to linked list.

Amazon,

1085

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

Amazon,

1111

worst case complexities of Quick sort and Merge sort.

Amazon,

1023

What do you mean by hashing?

Amazon,

1102

What is the definition of tree ?

Amazon,

1034

When can you say a graph to be a tree?

Amazon,

1083

What do you mean by constant time complexity?

Amazon,

1231

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

Amazon,

1095

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

Amazon,

1096

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

Amazon,

1362

What are the differences between graph and tree?

Amazon,

1121

Differentiate between overriding and overloading cases?

Amdocs,

1102

Differentiate between run time error and syntax error.

Amdocs,

1124

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Un-Answered Questions { Core Java }

What is the collections api in java programming?

977

What are the different collection views provided by maps?

984

What is a parameter in simple terms?

992

What java is used for?

1070

What is arraylist class in java?

1057

How to declare an arraylist in java?

1107

what r advatages of websphere? & how to deploy?

2185

What is an object class?

1024

What is finalize()?

1185

How do generics work?

938

What is core java used for?

1118

What is meant by bytecode?

1021

What is the difference between hashmap and hashtable? What is an interface?

1158

What are green threads in java?

998

What is difference between final and immutable?

1142

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