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 14016

java is puerly object oriented or not ?

5 6839

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

2 5011

difference between byte stream class and character stream class?

4558

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 5041

What are the notations in Java?

Cap Gemini,

1 8852

What are library required to connect to excel sheet.

Cap Gemini,

2 6209

What is “try and catch” in java

Cap Gemini, TCS,

5 8604

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 8023

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 4519

how to crate clint-server socket?

Accenture, Infosys, Infotech, TCS,

1 5044

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

2 4956

how to connect two diffrent applet files

3014

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 5908

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Un-Answered Questions { Core Java }

Can we call thread start () twice?

964

What is run time allocation?

1025

What is the difference between size and length in java?

975

What is the purpose of return statement?

1064

Explain about version control?

1039

If an object is garbage collected, can it become reachable again?

1000

why using interface interface ?

2046

What is the use of flag?

1092

Which is the class in java?

1055

What is the default size of arraylist in java?

1128

What is comparable and comparator interface? List their differences

1110

What is null mean in java?

1097

Can an interface be final?

1030

How to remove the trailing spaces from a string?

1274

Does java vector allow null?

959

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