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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 5948

while creating thread why we extend thread class

2 3487

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 8084

what is mean by synchronization?

BOB Technologies, GCPL,

3 3950

what is mean by thread lock?

Infosys, TCS,

2 4641

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 4321

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 2749

how system.out.println() works?

2 3362

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 3425

What is the alternate of 'Inheritance' ?

CybAge, HCL,

4 11240

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

TCS,

1 12812

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

HCL,

12 10168

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 4637

what is object slice?

1172

why did you choose your career in IT?

LIC,

1 1758


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Un-Answered Questions { Core Java }

What is the major difference between linkedlist and arraylist?

135


Difference between java and javascript

157


How do you remove spaces in java?

109


How do you read a char in java?

116


Break statement can be used as labels in java?

133






What is data type example?

122


What is the difference between yielding and sleeping?

137


What is the finalize method do?

157


Is list ordered in java?

114


What is difference between stringbuffer and string?

127


Can we extend a class with private constructor?

111


Why Do I Get A "permission Denied" Error After Downloading The .jnlp Java Launcher For The Vkvm?

185


Do you know how to reverse string in java?

149


What is the difference between public, private, protected, and friend access?

168


What are the important methods of java exception class?

151