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 3963

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

College School Exams Tests, Infosys, Six Dee Telecom,

10 12592

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

CGI,

2167

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

CTS, Infosys,

4 10201

does core java and j2se both are same?

5 14672

what is difference between signed & unsigned char?

2 4903

What is the blank final variable?

3 6376

difference throws and throw in java

3 5109

What is “try and catch” in java

2 4648

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

1 2993

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

Eka Software,

1 3804

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

Eka Software,

1 4452

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

IBM,

1 2841

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 5674

how can you say that java is independ language

TCS, Wipro,

2 5628

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Un-Answered Questions { Core Java }

Why vector class is used?

938

Explain the difference between an object-oriented programming language and object-based programming language?

942

What is += mean in java?

960

What is the order of arraylist in java?

1069

What is the effect of keeping a constructor private?

887

Does set allows null in java?

914

What is class forname?

954

what is recursion in java

1089

Is the empty set a singleton?

920

What is jit compiler in java?

1039

What is hotjava?

962

What class of exceptions are generated by the java run-time system?

1131

What are autoboxing and unboxing? When does it occur?

902

Explain how to force the garbage collection in java.

929

What are dot operator queries?

1064

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