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 14127

java is puerly object oriented or not ?

5 6978

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

2 5127

difference between byte stream class and character stream class?

4601

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 4111

i need source code for income tax program using java inheritance

1 5132

What are the notations in Java?

Cap Gemini,

1 8935

What are library required to connect to excel sheet.

Cap Gemini,

2 6318

What is “try and catch” in java

Cap Gemini, TCS,

5 8808

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 8166

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 4596

how to crate clint-server socket?

Accenture, Infosys, Infotech, TCS,

1 5120

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

2 5043

how to connect two diffrent applet files

3085

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 6034

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Un-Answered Questions { Core Java }

What is are packages?

1085

Who developed java?

1056

What is another word for methodology?

1076

How do you calculate square roots?

1216

What is the difference between JDK and JVM?

1339

What is default size of arraylist in java?

1224

What are the different types of java?

1110

What is the difference between scrollbar and scrollpane?

1131

Can we create an object if a class doesn't have any constructor ( not even the default provided by constructor ) ?

1134

What is array in java?

1056

what is bmg file and how to create that files?what will it contailn?

2396

What is sorting algorithm in java?

1148

when to use ArrayList and when to use HashMap in webApplication.

4785

Explain creating threads by extending thread class ?

1091

What is vector?

1124

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