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

Core Java Interview Questions

Questions Answers Views Company eMail

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

HCL,

7 22296

In Serialization, whether you will use Static variables?

HCL,

3 9778

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

4 8123

Is java supports multiple inheritance? explain?

BUET, Inforica,

12 20495

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

1 5268

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 9127

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 31050

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

CTS, Honeywell, McAfee,

13 30044

what is difference between abstraction and interface?

FIC,

8 13141

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

11 34771

Describe inheritance as applied to java?

4 11503

what is a package?

11 15459

what is a thread?

IBM, SunGard,

13 21758

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 8243

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 20570

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Un-Answered Questions { Core Java }

What happens when a thrown exception is not handled?

1071

Why are the destructors for base class and derived class called in reverse order when the program exits

2149

What are packages in java?

1511

How can you say java is object oriented?

1026

What language is an assembler written in?

961

Why strings in java are called as immutable?

959

If you do not want your class to be inherited by any other class. What would you do?

964

I want to re-reach and use an object once it has been garbage collected. Define how it’s possible?

989

Is there a sort function in java?

935

How to make a write-only class in java?

1032

What is a file pointer?

1018

What is nullpointerexception in java?

1068

What does this () mean in constructor chaining concept?

1072

What are the uses of java?

1043

Is java free for businesses?

1038

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