MidExam

package midexam;

public interface GeometricObject
{
    public double getPerimeter();
    public double getArea();
}

public class Circle implements GeometricObject
{
    Circle()
    {
        super();
    }
    protected double radius=1.0;

    public void setradius(double radius)
    {
        this.radius=radius;
    }
    public double getradius()
    {
        return radius;
    }
    public double getPerimeter()
    {
        return 2*3.1416*radius;
    }
    public double getArea()
    {
        return 3.1416*radius*radius;
    }
}

public class TestCircle extends Circle
{
    TestCircle()
    {
        super();
        System.out.println("Perimeter : "+getPerimeter());
        System.out.println("Area : "+getArea());
    }
}

public interface Resizable
{
    public abstract void resize(int percent);
}

public class ResizableCircle extends Circle implements Resizable
{
    public double radius=1;
    ResizableCircle()
    {
        super();
    }
    ResizableCircle(double radius)
    {
        super();
        this.radius=radius;
    }

    public void setradius(double radius)
    {
        this.radius=radius;
    }
    public double getradius()
    {
        return radius;
    }
    public void resize(int percent)
    {
        double c = (radius * percent)/100;
        System.out.println("Radius was: "+radius);
        System.out.println("Resized radius is : "+c);
    }
}

public class TestResizable extends ResizableCircle
{
    TestResizable()
    {
        super();
    }
}

public class MidExam
{
    public static void main(String[] args)
    {
        TestResizable tr = new TestResizable();
        ResizableCircle r = new ResizableCircle();
        r.setradius(1);
        r.resize(20);
        TestCircle tc = new TestCircle();
        Circle c = new Circle();
    }
}