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

Core Java Interview Questions

Questions Answers Views Company eMail

What is exception propagation?

1151

Write a java program that prints all the values given at command-line.

1025

Can we declare the static variables and methods in an abstract class?

1004

Write a program in java to establish a connection between client and server?

987

What is the final variable?

1 1265

Can an unreferenced object be referenced again?

1209

Write a program in java to calculate the difference between the sum of the odd level and even level nodes of a binary tree.

1077

Can we declare an interface as final?

1081

How many types of constructors are used in java?

1208

What is the difference between compile-time polymorphism and runtime polymorphism?

1014

Can you use this() and super() both in a constructor?

996

What is an i/o filter?

5 1853

What is the difference between serializable and externalizable interface?

1120

Can we execute a program without main() method?

1053

What is the difference between static binding and dynamic binding?

1149

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Un-Answered Questions { Core Java }

Is int a class in java?

991

What are the benefits of operations in java?

1071

What happens if I remove static from main method?

1025

What is string array?

1079

What is a method signature java?

1065

Is it correct to say that due to garbage collection feature in java, a java program never goes out of memory?

1041

What is the purpose of nested class in java?

1102

Explain the scope or life time of class variables or static variables?

1007

When should I use singleton pattern?

1058

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

1388

What restrictions are placed on method overloading?

1193

What is java volatile?

1075

What is argument in java?

1034

How many bits is a word?

1020

Explain different types of thread priorities ?

1113

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