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 3710

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 5668

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

Wipro,

3 10066

how to create a jar file in java

1 5196

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

2 5611

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

2 4457

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

IBM,

7 11576

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

IBM, Microsoft,

1 5184

why constructor dont have returns type?

IBM,

9 14591

is JVM platform dependent or independent..?

IBM, Tech Mahindra,

11 41361

what is difference between interface and abstract class..?

4 7136

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

Persistent, Societe Generale,

8 34800

what is the collable collections in java?

Persistent,

2 12497

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.

2081

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Un-Answered Questions { Core Java }

What is the r character?

1077

Is static a singleton?

1028

Can we create an object of static class in java?

1058

What is java jit compilers?

1062

What is the integer of 16?

1040

Tell me the latest versions in java related areas?

1140

What do you mean by light weight and heavy weight components?

1067

What is a variable analysis?

1141

What is a native method in java programming?

1113

Does list maintain insertion order java?

969

Give the hierarchy of inputstream and outputstream classes.

1159

Why should we use singleton pattern instead of static class?

978

What is final?

1139

What are annotations in java?

1139

Can we override the private methods?

1061

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