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

Core Java Interview Questions

Questions Answers Views Company eMail

hi to all,i have a question on static block. i saved below as test.java class test extends a { static { System.out.println("test static"); } public static void main(String []dfs) { } } class a { static { System.out.println("a static"); } public static void main(String []asdf) { } } o/p as static test static but if i change base class as test class then class test { static { System.out.println("test static"); } public static void main(String []dfs) { } } class a extends test { static { System.out.println("a static"); } public static void main(String []asdf) { } } o/p test static explain me why "a static" wasn't print in second code when it is in derived class

1 3610

what are the uses of Class class and what it returns? explain it with the example code.

1 3812

class test { private static void main(String []adsf) { } } explain me that the above code is error or exception

3 5539

class a extends b { } class b extends a { } why java doesn't support cyclic pls explain me with example

Wipro,

3 9925

how to create a jar file in java

1 5115

what is the main difference between string and stringbuffer? can you explain it with program?

2 5497

How can i add a button in applet in java ???

2 4367

did interface can implementation method ? i know its not possible but my interviewer said its possible ..but how..? any one have idea ???

IBM,

7 11331

how to make the double-tone class ? as we have singletone class..?

IBM, Microsoft,

1 5078

why constructor dont have returns type?

IBM,

9 14306

is JVM platform dependent or independent..?

IBM, Tech Mahindra,

11 40990

what is difference between interface and abstract class..?

4 6957

How to make a method thread safe without using synchronized keyword?

Persistent, Societe Generale,

8 34519

what is the collable collections in java?

Persistent,

2 12389

we have syntax like for(int var : arrayName) this syntax is to find whether a number is in the array or not.but i want to know how to find that number's location.

2034

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Un-Answered Questions { Core Java }

Which graphs are functions?

971

What does file separator do in java?

1014

What is a method type?

1005

How to create a custom exception?

995

What is empty list in java?

1074

Which method cannot be overridden in java?

992

Can a abstract class be defined without any abstract methods?

1003

What is the importance of hashcode() and equals() methods?

1054

Can you use this() and super() both in a constructor?

985

What is increment in java?

962

What is oops in java?

1020

What is the difference between synchronized and synchronized block?

1066

Why is serialization required?

957

List primitive java types?

1033

Is it possible to override the main method?

981

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