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 13986

java is puerly object oriented or not ?

5 6817

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

2 4998

difference between byte stream class and character stream class?

4552

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 4009

i need source code for income tax program using java inheritance

1 5027

What are the notations in Java?

Cap Gemini,

1 8842

What are library required to connect to excel sheet.

Cap Gemini,

2 6191

What is “try and catch” in java

Cap Gemini, TCS,

5 8580

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 8012

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 4511

how to crate clint-server socket?

Accenture, Infosys, Infotech, TCS,

1 5029

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

2 4943

how to connect two diffrent applet files

3009

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 5887

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Un-Answered Questions { Core Java }

Why parameters should be passed by reference?

961

Explain about join() method?

960

Which is faster string or stringbuilder?

921

What is an error in java?

1147

How can we make string upper case or lower case?

1069

What about static nested classes in java?

1134

What are thread priorities and importance of thread priorities in java?

1131

If a method is declared as protected, where may the method be accessed in java programming?

990

What is meant by 'bit masking' in java?

1183

Why is java called the platform independent programming language?

1004

Can this keyword be used to refer static members?

1023

How can you read an integer value from the keyword when the application is runtime in java? example?

1125

What is the difference between the ">>" and " >>>" operators in java?

983

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

1362

What is empty list in java?

1071

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