Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

If there is no implementation of MARKER INTERFACE in java. Then how compiler come to know about specification.

2 6443

How can be define MARKER interfce in java

1 6386

How two different class threads communicate with each other?. send example code.

4 9191

public class BatchTest { public static void main(String[] args) { Runtime run = Runtime.getRuntime(); try { Process p = run.exec("cmd start /c D:/test.bat"); System.out.println(p.exitValue()); } catch (Exception e) { e.printStackTrace(); } System.out.println("FINISHED"); } }

2347

What is the difference between this() and super()?

TCS,

15 39879

Which of the following can be referenced by a variable? A. The instance variables of a class only B. The methods of a class only C. The instance variables and methods of a class

2 16555

how can u apply shallow cloning and deep cloning to create object?

Yash Technologies,

1 7327

I am unable to find or learn about print command. I have a graphical program in core java in applet but i want to give print command but i have coding for that so if anyone know about this plz mail me on avdhesh_chauhan007@yahoo.co.in

2047

please tell me what is wrapper class in java with example ?

HP,

6 20664

How to declare unique ArrayList ?

RMSI,

6 18263

How to override a equals() method and what is the use?

1 4723

A abstract class extending an abstract class.Super class has both abstract and non-abstract methods.How can we implement abstract and non-abstract mehtods? Explain with snippet

3 6045

what is the difference between java and j2ee... is that can i work j2ee on net beans IDE 6.0

2 5933

what is the difference between AWT and SWING what is the advantage of using swing?

3 13948

Convert a binary search tree to a sorted doubly linked list inplace.

Amazon,

1 9802

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Un-Answered Questions { Core Java }

Explain the protected field modifier?

1032

Can we have any code between try and finally blocks?

973

Can private method static?

874

What are the difference between string, string builder, and string buffer in java?

1081

What is meant by nested loop?

983

What is the difference between serializable and externalizable interfaces?

1034

Java is pass by value or pass by reference? Explain

942

Why destructor is not used in java?

935

What is string data type?

920

What is a map? What are the implementations of map?

1048

How does hashmap work in java ?

990

Is 9 a prime number?

843

How do you sort an array in java?

943

What are the different types of inner classes?

975

For ease of programming you can consider the maze as a 2D array with colors represented by below integer and characters (in capital letters). • B - Black • W -White • G- Green • R- Red R B W B W W W W W W B W B B W W W W W W W B W B W W W B W W W W B B W W W B W W W B W W B B B B W B W B W W B W W W B W W W B B B W W B W W W B W W B W B W W W B W B W W W W B B W W W W B W W W W W G Shortest Route Problem: • Solution that finds the shortest Route between Red and Green  White will have 1 Weight.  Red and Green carry no weights.  Shortest path is the path with less weight when you add up the weights in the path.

1985

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