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 3507

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

1 3731

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

3 5402

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

Wipro,

3 9787

how to create a jar file in java

1 5031

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

2 5353

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

2 4258

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

IBM,

7 11050

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

IBM, Microsoft,

1 5001

why constructor dont have returns type?

IBM,

9 14048

is JVM platform dependent or independent..?

IBM, Tech Mahindra,

11 40531

what is difference between interface and abstract class..?

4 6755

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

Persistent, Societe Generale,

8 34181

what is the collable collections in java?

Persistent,

2 12282

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.

1991

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Un-Answered Questions { Core Java }

Why is string builder not thread safe?

1021

Which programming language is best in future?

899

v-model life cycle

2001

What is difference between hashset and hashmap?

1061

Why multiple inheritance is not supported by java?

936

What are the types of sockets in java?

1068

How do you check if a character in a string is a digit or letter?

1015

What is the private method modifier?

1039

How do you create a sop?

949

What is the purpose of the enableevents() method in java programming?

1095

Can we have 2 main methods in java class?

960

How will you get the platform dependent values like line separator, path separator, etc., ?

961

Does string is thread-safe in java?

1033

Explain about anonymous inner classes ?

1023

Which one will take more memory: an int or integer?

1174

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