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

Core Java Interview Questions

Questions Answers Views Company eMail

whether java is fully object oriented language or partially object oriented language

Infosys, ME, SMK,

4 8482

while creating thread why we extend thread class

2 4982

How HashMap implemented in java? how it internally works when values are added or searched from hashMap?What is the difference betweenthe implementation of hashmap and Linked Hashmap?

IBM,

3 10682

what is mean by synchronization?

BOB Technologies, GCPL,

3 6532

what is mean by thread lock?

Infosys, TCS,

2 6473

I declared main() method as private. But it still running and displaying the output. Please Answer it . Code Snippet as Below: import java.io.*; class over { private static void main(String[] args) { int high = Integer.MAX_VALUE; int overflow = high + 1; int low = Integer.MIN_VALUE; int underflow = low - 1; System.out.println(high + "\n" +overflow +"\n"+ low +"\n"+underflow); //System.out.println(overflow); //System.out.println(low); //System.out.println(underflow); } }

Cap Gemini,

4 7441

Hi Every One I Have Small Doubt Please answer This???????????????????????????? I Want to use AbstractList class methods(java.util.AbstractList) My Program is import java.util.*; class DemoOne extends AbstractList { public static void main(String[] args) { AbstractList a=new DemoOne();//This One is Correct?? DemoOne a1=new DemoOne();//This One is Correct?? Both Are Not Working System.out.println("Hello World!"+a); System.out.println("Hello World!"+a1); } } Error IS: DemoOne.java:2: DemoOne is not abstract and does not override abstract method get(int) in java.util.AbstractList class DemoOne extends AbstractList AnyOne can Please Provide The Solution????????????????????????? Plzzzzzzz

3 4836

how system.out.println() works?

2 5140

In Inheritance if we are implementing Multi level inheritance and all class having same name of variable and now i want to access each class variable and how it is possible?

2 5060

What is the alternate of 'Inheritance' ?

CybAge, HCL,

4 13955

explain how many oops concepts available in java with realtime scenarios?

TCS,

1 14250

int a=1,b=10; System.out.println(a+b--);

HCL,

12 17265

1) Find the Merge point of two linked lists. 2) Swap two bits of integer. 3) Reverse individual words of the sentence. 4) Reverse string without using temp string.

HCL,

2 6589

what is object slice?

2087

why did you choose your career in IT?

LIC,

1 3778

Post New Core Java Questions

Un-Answered Questions { Core Java }

Difference between start() and run() method of thread class?

1071

How do you escape json?

995

How many digits can a float hold?

1012

What are the main uses of java?

992

How can an exception be thrown manually by a programmer?

1003

What is the final keyword denotes?

1112

What is the basic concept of java?

1018

What is variable length arguments in java?

976

EDS (Electronic Data Systems India Pvt Ltd) at Chennai on 16-12-2006.

9210

What is private protected in java?

1052

What are the types of methodology?

1103

Why stringbuilder is not thread safe?

1034

What is the difference between comparison done by equals method and == operator?

1026

What are different types of classloaders?

1019

Which collection does not allow duplicates in java?

980

For More Un-Answered { Core Java } Questions Click Here