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Java Related Interview Questions
Questions Answers Views Company eMail

Why runnable interface is used in java?

1136

How garbage collection is done in java?

1051

There are two classes named classa and classb. Both classes are in the same package. Can a private member of classa can be accessed by an object of classb?

1490

What is the base class in java from which all classes are derived?

979

Can we declare a class as abstract without having any abstract method?

1000

Which of the following classes will have more memory allocated?

1017

Does importing a package imports its sub-packages as well in java?

969

How objects of a class are created if no constructor is defined in the class?

1071

Give an example of use of pointers in java class.

1031

I want to persist data of objects for later use. What is the best approach to do so?

1064

What is the purpose of static methods and static variables?

1071

What are java packages?

1033

What are the performance implications of interfaces over abstract classes?

1 3665

How can you generate random numbers in java?

1048

When a lot of changes are required in data, which one should be a preference to be used? String or stringbuffer?

1240


Un-Answered Questions { Java Related }

What is jms in websphere?

871


What do you mean by composition in java?

1024


What is OOP's Terms with explanation?

1187


What is difference between hibernate and spring?

408


3.2 Consider the following class: public class Point { protected int x, y; public Point(int xx, int yy) { x = xx; y = yy; } public Point() { this(0, 0); } public int getx() { return x; } public int gety() { return y; } public String toString() { return "("+x+", "+y+")"; } } Say you wanted to define a rectangle class that stored its top left corner and its height and width as fields. 3.2.1 Why would it be wrong to make Rectangle inherit from Point (where in fact it would inherit the x and y coordinates for its top left corner and you could just add the height and width as additional fields)? (1) 8 Now consider the following skeleton of the Rectangle class: public class Rectangle { private Point topLeft; private int height, width; public Rectangle(Point tl, int h, int w) { topLeft = tl; height = h; width = w; } public Rectangle() { this(new Point(), 0, 0); } // methods come here } 3.2.2 Explain the no-argument constructor of the Rectangle class given above. 3.2.3 Write methods for the Rectangle class to do the following: • a toString() method that returns a string of the format "top left = (x, y); height = h; width = w " where x, y, h and w are the appropriate integer values. • an above() method that tests whether one rectangle is completely above another (i.e. all y values of the one rectangle are greater than all y values of the other). For example, with the following declarations Rectangle r1 = new Rectangle(); Rectangle r2 = new Rectangle(new Point(2,2), 1, 4); the expression r2.above(r1) should give true, and r2.above (r2) should give false. (You can assume that the height of a rectangle is never negative.) (2) (5)

2980


What is the epoch date?

1023


Why to use nested classes in java?

1120


What are dispatcher servlet and context loader listener?

530


What is the purpose of using bufferedinputstream and bufferedoutputstream classes?

1071


EDS (Electronic Data Systems India Pvt Ltd) at Chennai on 16-12-2006.

9210


I have a process running on one of my unix terminals, but I cannot close the terminal window as the process will terminate. How can I transfer this process to a background process?

1110


Is java swing deprecated?

1104


What is java oops?

1081


What is mutable object and immutable object?

1128


What are aspect, advice, pointcut, and joinpoint in aop?

469