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 3612

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

1 3814

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 9927

how to create a jar file in java

1 5117

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

2 5499

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

2 4369

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

IBM,

7 11337

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

IBM, Microsoft,

1 5079

why constructor dont have returns type?

IBM,

9 14309

is JVM platform dependent or independent..?

IBM, Tech Mahindra,

11 41000

what is difference between interface and abstract class..?

4 6958

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

Persistent, Societe Generale,

8 34523

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 }

What does += mean coding?

935

What is == in java?

1016

What is an eror in java?

1054

Can we declare an interface as final?

1067

What is the difference between super class & sub class?

1195

What is methodological framework?

1045

What is the argument in java?

921

What is the difference between interface & abstract class?

1045

What is busy spin, and why should you use it?

1086

Considering notepad/ie or any other thing as process, what will happen if you start notepad or ie 3 times? Where 3 processes are started or 3 threads are started?

1156

What is java used for on a computer?

995

Is int primitive data type?

949

what is predefined function in java?

984

What is difference between float and double?

962

Explain java coding standards for interfaces?

1112

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