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

Core Java Interview Questions

Questions Answers Views Company eMail

what is for datainputstream?

1 4041

What is the use of static keyword in "public static void main()"

College School Exams Tests, Infosys, Six Dee Telecom,

10 12903

what is mena by object block any what is the use of that

CGI,

2212

can any body tell me? does advance java and j2ee both are same.

CTS, Infosys,

4 10338

does core java and j2se both are same?

5 14843

what is difference between signed & unsigned char?

2 5001

What is the blank final variable?

3 6506

difference throws and throw in java

3 5219

What is “try and catch” in java

2 4757

Integer.parse Int(bf.readLine(System.out.println("enter value for n["+m+"]:"))); can it run under this

1 3056

what is mean by ooad? where we are using? can you tell me any real time example?

Eka Software,

1 3887

What is mean by UML? what is the use? where we are using?

Eka Software,

1 4532

Any one can explain how the inerface uses in java. give with example.

IBM,

1 2928

interface X{ void m1(); void m2(); } class Child2 extends Object implements X { public void m1(){ System.out.println("Child2 M1"); } public void m2(){ System.out.println("Child2 M2"); } } public class ParentChildInfterfaceDemo { public static void main(String[] args){ X x = new Child2(); X x1 = new Child2(); x.m1(); x.m2(); x.equals(x1); } } Will the above code work? If yes? Can you please explain why the code x.equals(x1) will work as the equals method is called on interface reference vaiable?

2 5756

how can you say that java is independ language

TCS, Wipro,

2 5708

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Un-Answered Questions { Core Java }

What’s the difference between unit, integration and functional testing?

1102

What are namespaces in java?

1031

What is the purpose of return statement?

1056

Can we have multiple public classes in a java source file?

1181

Define reflection.

990

Can a class extends itself in java?

1019

What does %d do in java?

1038

Can you sort a list in java?

979

How do generics work in java?

1023

What is string args [] in java?

1031

Define immutable object?

1048

Is null or empty java?

980

Why vector is used in java?

1025

What's the difference between int and integer in java?

1153

What modifiers are allowed for methods in an interface?

1156

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