Question

I have an interface named SHAPE. CIRCLE and RECTANGLE are two classes implementing this interface. Now I have to write a class (i have an option to write a class only) CIRCULARRECTANGLE which will extend the properties of CIRCLE and RECTANGLE. How to do this in Java?

Answer 1

Since Java extends one class at a time, you will need to create abstract classes to fit your criteria.

Example:

public abstract class AbstractRectangle extends Rectangle {

public abstract class AbstractCircularRectangle extends AbstractRectangle {

public class CircularRectangle extends AbstractCircularRectangle {

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Update: My first attempt will never work, hence my update:

Since my first attempt never extended a Circle, you will need to keep reference to eiter a Circle or a Rectangle like so:

public class CircularRectangle extends Rectangle {

    private Circle circle;

    public CircularRectangle(Circle circle) {
        this.circle = circle;
    }

    // Some logic:
}

The purpose of the constructor is to keep reference to a circle.