Disk

package puck;

public class Disk extends Circle {
    private double thickness;

    public Disk(double r, double t) {
        super(r);
        thickness = t;

    }

    public void setThickness(double newThickness) {
        thickness = newThickness;
    }

    public double getThickness() {
        return(thickness);
    }

    public double volume() {
        double v;

        v = super.area() * thickness;
        return(v);
    }

    public boolean equals(Object obj) {
        Disk testObj = (Disk)obj;

        if (testObj.getRadius() == super.getRadius() &&
            testObj.getThickness() == thickness) {
            return(true);
        } else {
            return(false);
        }
    }

    public String toString() {
        String diskString;

        diskString = "The disk has radius " + super.getRadius() +
                     " and thickness " + thickness;
        return(diskString);
    }
}