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Core Java Interview Questions
Questions Answers Views Company eMail

Which is the best way to use for String concatenation in Java?

HCL,

7 18176

In Serialization, whether you will use Static variables?

HCL,

3 7741

How do you relate a Interface to a Class? Tell me in Detail?

4 5417

Is java supports multiple inheritance? explain?

BUET, Inforica,

12 13858

which swing component is similar to rich text box in .net/vb

1 3658

Which One is optimal to choose ? Syncronized hash map or Hash table with single thread model? How can a hash map syncronized with out using syncrozed blocks in programm?

Four soft,

3 6922

int a=10,b=20,c=30 a= b+c;b=a+c;c=a+b; System.out.println("The value is"+a+b+c;

Honeywell,

17 19056

int a=1; float b=1.0; System.out.println(a==b);

CTS, Honeywell, McAfee,

13 21770

what is difference between abstraction and interface?

FIC,

8 8498

waht happens when a return type ,even void is specified for a constructor?

11 26052

Describe inheritance as applied to java?

4 8716

what is a package?

11 9390

what is a thread?

IBM, SunGard,

13 15063

class{ ... ... interface myinterface{ ... ... } abstract class{ .. .. } ... .. .. } is this possible to write "Interface and/ or Abstract class inside a class ? if possible whcich one is possible is only interface? is only abstract?

Logica CMG,

2 6397

class A{ m2(){ } } class B extends A{ m2(){ } } class c extends B{ m2(){ } } class my_class extends c{ m2(){ } pulic static void main(){ ...My_class a = new my_class(); super.super.super.m2(); is this is leagal if not find what is the legal procedure in order to call A's version of m2(); }

Logica CMG,

8 15735


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Un-Answered Questions { Core Java }

How can you write a loop indefinitely in java programming?

185


Can we have a method name same as class name in java?

182


What is meant by 'bit masking' in java?

211


When should I use singleton?

147


What are mutable classes?

165






What is the difference between the size and capacity of a vector?

188


Explain treeset?

177


Can we make constructors static?

153


What are the changes in java.io in java 8 ?

163


What is a boolean in java?

146


How do you add spaces in java?

150


How do I stop concurrentmodificationexception?

123


How does indexof work?

138


What is class level lock ?

202


What is the largest long allowed by java?

139