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

Core Java Interview Questions

Questions Answers Views Company eMail

Can a class extend abstract class or interface? why

Wipro,

4 9084

What is the difference between Access Modifier and Access specifier?

1 6747

Is it possible to write method inside method

L&T,

4 11232

what is the default value of a variable char?(If not assigned)

4 6867

Write a java program to get a string of words and print the numbers of each word count in descending order

Logica CMG, Subex,

11 29580

Where can I find data structures question and answers with comprehensive working code written in Java

Amazon,

2278

if the memory capacity is 700 presently occupied by process is 690. then another process request space(40) how this situation handled in java.

Wipro,

4 6397

what is the logic inside any default constuctor?

2 4032

How TreeMap sorts the objects inside it?? suppose if have include one employee object and one car object. On what basis it will sort?

5 14097

Java is based on pass by reference or pass by value ..

L&T, Wipro,

6 10100

difference between arraylist and linkedlist otherthan performance

L&T,

2 10207

why pointer is not used in java?

3 11261

what are the difference between Java and .Net?

5 7856

can any body body expalin best definitions & best real time exaples for opps concepts.

Accel,

2117

What is map and hashmap? also tell the difference.

1 4099

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Un-Answered Questions { Core Java }

What is string in java is it a data type?

832

Write a method to check if input string is palindrome?

855

When a lot of changes are required in data, which one should be a preference to be used? String or stringbuffer?

1102

Is the empty set a singleton?

800

Is string is a class in java?

791

Explain an algorithm to find depth of a binary tree.

884

Why is java called the platform independent programming language?

870

What is sorting algorithm in java?

850

What is string english?

847

What is vector?

844

Name some classes present in java.util.regex package.

882

What is lifetime variable?

805

Are generics important java?

802

Can we force the garbage collection to run?

795

What do you mean by Function Overloading in java?

1022

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