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

Core Java Interview Questions

Questions Answers Views Company eMail

Why ArrayList class is not a synchronized class and why it is not a thread safe class? explain

1 4995

what is actual real time using of oops concepts in projects(Interface,polymorphism.abstraction.........)

2 11105

I have 2 objects inside one object(vector). how can i serialize one of them. I dont want to serialize the second one

ABC, L&T,

3 8914

What is the difference between Synchronizing mehtod & Synchronizing block?

2 5990

what is check p object in java

TCS,

1 4249

what is the need to set path in java? how many ways to set path in java? Explain breif?

5 20726

What Is Pointer?

4 5559

how to print the below in java?thanks in advance.... * * * * * * * *

3 5214

how to print the below in java? * * * * * * * * *

2 4945

difference between String a; and String a=new String();? y do v need to assign memory to the variable?

2 5996

In how many ways we can the thread? in java

3 9312

how to make a un-checked exception as a checked exception one.

2 5269

Why only one Class is public in one file? Explain in details. Thanks in Advance.

12 17107

Hi can u pls tell me what is the use of marker interface. Iknow what is marker interface but what ability will the object get by implementing this.

CGI,

3 6081

what is the replacement method of stop() of thread

IBM, TCS,

8 12219

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Un-Answered Questions { Core Java }

What's the purpose of static methods and static variables?

1045

How do you compare characters in java?

928

What is the use of hashmap in java?

1029

What does null mean in java?

1027

what is the difference between the methods sleep() and wait()? : Java thread

914

How do you use parseint in java?

942

Why 1 is not a prime number?

983

What is the difference between keyword and identifier?

985

Why doesn't the java library use a randomized version of quicksort?

940

how to write a program for sending mails between client and server

2032

Is java call by reference?

931

Why string is a class?

902

what is mutual exclusion? : Java thread

970

How do you achieve polymorphism in java?

951

Explain about exception propagation?

986

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