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 3713

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

1 3899

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

3 5673

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

Wipro,

3 10069

how to create a jar file in java

1 5200

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

2 5616

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

2 4459

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

IBM,

7 11580

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

IBM, Microsoft,

1 5190

why constructor dont have returns type?

IBM,

9 14595

is JVM platform dependent or independent..?

IBM, Tech Mahindra,

11 41390

what is difference between interface and abstract class..?

4 7142

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

Persistent, Societe Generale,

8 34807

what is the collable collections in java?

Persistent,

2 12503

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.

2083

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Un-Answered Questions { Core Java }

Can a method be overloaded based on different return type but same argument type?

1019

what are three ways in which a thread can enter the waiting state? Or what are different ways in which a thread can enter the waiting state? : Java thread

1040

What is palindrome in java?

1044

What does provide mean construction?

1158

What are generic methods?

1049

How do you trim a space in java?

1029

What is the difference between arraylist and hashset in java?

1246

Can java arraylist hold different types?

1156

Are there structures in java?

1030

Is heap stored in ram?

1022

What is executor memory?

1008

What is an example of character?

1208

What is a values collection view ?

1153

What is a marker interface?

1228

Why set is used in java?

1070

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