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 3617

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

1 3818

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

3 5546

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

Wipro,

3 9933

how to create a jar file in java

1 5118

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

2 5507

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

2 4370

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

IBM,

7 11344

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

IBM, Microsoft,

1 5083

why constructor dont have returns type?

IBM,

9 14314

is JVM platform dependent or independent..?

IBM, Tech Mahindra,

11 41014

what is difference between interface and abstract class..?

4 6961

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

Persistent, Societe Generale,

8 34534

what is the collable collections in java?

Persistent,

2 12393

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 is a nested structure?

1045

Write a java program for binary search?

1073

What is java object name?

1000

What are access specifiers in java ?

1146

What is a conditional equation?

1046

Why generics are used in java?

1057

Can a class with private constructor be extended?

948

What is a method header?

1024

What all access modifiers are allowed for top class ?

1189

What are the main features of java?

972

What is the applet security manager, and what does it provide?

999

How can an object be unreferenced?

1025

What is the use of coding?

967

How java uses the string and stringbuffer classes?

1081

What are the default and parameterized constructors?

1060

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