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

Core Java Interview Questions

Questions Answers Views Company eMail

abstract class Demo { public void show() { System.out.println("Hello I am In show method of Abstract class"); } } class Sample extends Demo { public void show() { super.show(); System.out.println("Hello I am In Sample "); } } public class Test { public static void main(String[] args) { //I WANT TO CALL THE METHOD OF BASE CLASS IT IS POSSIBLE OR NOT CAN WE USE SCOPE RESOLUTION OPERATOR TO CALL OR JAVA NOT SUPPORTED THAT :: OPERATORE } }

3 14012

java is puerly object oriented or not ?

5 6834

i need income tax program using java inheritance concept. could u please help me?

2 5007

difference between byte stream class and character stream class?

4557

why should we get the following error ? Exception in main method NoClassDefFoundError:classname could anyone give the detail clarification on how java compiler can look for .class file?

2 4024

i need source code for income tax program using java inheritance

1 5039

What are the notations in Java?

Cap Gemini,

1 8852

What are library required to connect to excel sheet.

Cap Gemini,

2 6206

What is “try and catch” in java

Cap Gemini, TCS,

5 8600

Scenario: There are 1 to 100 numbers. Each number should be keep in the each column like from A column to Z column ie 1 to 26. From 27 to 52 should be in 2nd row in the excel sheet. This has to be continue till 100. How do you write Java program and what are various methods.

Cap Gemini,

4 8022

public class Base { public void myMethod(int a,intb) {} } // Uses myMethod and then hides it. public class DerivedOne extends Base { private void myMethod(int a,int b); } will this compile or not .yes or no. why

2 4518

how to crate clint-server socket?

Accenture, Infosys, Infotech, TCS,

1 5042

how an we achive multiple inhetitance in java using interface..??

2 4953

how to connect two diffrent applet files

3012

I need help please send me reply: Write a program "if given a string like 'HAT', the combination's returned should be like ATH,THA,TAH in java"?

4 5905

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Un-Answered Questions { Core Java }

Why java strings are immutable in nature?

1071

why java does not support unsigned keyword?

5254

Can set contain duplicates?

996

What is a key in java?

979

Explain when we should make an instance variable private.

1122

What does java stand for?

1122

Is null a value?

1040

What happens when you invoke a thread’s interrupt method while it is sleeping or waiting?

980

Does java allow overriding static methods ?

1112

Can a set contain duplicates?

952

What is the core java?

948

What is the maximum size of byte array in java?

1011

Are primitives objects?

1056

Which variables are stored in heap?

1029

What is the difference between an inner class and a sub-class?

1016

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