import java.lang.Object;

public class Circle {

	/**
	 * @param args
	 */

	private static final double PI=3.14;
	private double radius;

	public boolean equals(Object c){
		Circle testObj=(Circle)c;

		if(testObj.getRadius()==radius)
			return(true);
		else
			return(false);
	}

	public String toString(){
		String circleString;

		circleString="Circle has radius "+radius;
		return(circleString);
	}

	public Circle(){
		radius=1;
	}

	public Circle(double r){
		radius=r;
	}

	public void setRadius(double newRadius){
		radius=newRadius;
	}

	public double area(){
		double circleArea;

		circleArea=PI*radius*radius;
		return(circleArea);
	}

	public double getRadius(){
		return(radius);
	}

	public double circumference(){
		return(PI*2*radius);
	}

	public static void displayAreaFormula(){
		System.out.println("The formula for the area of a circle is a=Pi*r*r");
	}

	public static void main(String[] args){
		Circle spot=new Circle();

		spot.setRadius(3);
		System.out.println("Circle radius: "+spot.getRadius());
		System.out.println("Circle circumference: "+spot.circumference());
		displayAreaFormula();

		Circle spot1=new Circle(3);
		Circle spot2=new Circle(4);

		if(spot1.equals(spot2))
			System.out.println("Objects are equal.");
		else
			System.out.println("Objects are not equal.");
		System.out.println(spot1);
		System.out.println(spot2);
	}
}

//////

public class Disk extends Circle {

	/**
	 * @param args
	 */

	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 d){
		Disk testObj=(Disk)d;

		 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;
	}

}



////

public class TestDisk {


	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Disk saucer=new Disk(10,0.02);
		System.out.println("Disk radius: "+saucer.getRadius());
		System.out.println("Disk surface area: "+saucer.area());
		System.out.println("Disk volume: "+saucer.volume());
		Disk plate1=new Disk(12,0.05);
		Disk plate2=new Disk(12,0.07);
		if(plate1.equals(plate2)){
			System.out.println("Objects are equal.");
		}
		else{
			System.out.println("Objects are not equal.");
		}
		System.out.println(plate1);
		System.out.println(plate2);

		System.out.println();
		System.out.println();
		System.out.println();
		Puck hockeypuck=new Puck(4.7);
		System.out.println("Puck weight: "+hockeypuck.getWeight());
		if(hockeypuck.getDivision())
			System.out.println("Puck division: Youth");
		else
			System.out.println("Puck division: Standard");
		Puck puck1=new Puck(5.7);
		Puck puck2=new Puck(4.1);
		if(puck1.equals(puck2))
			System.out.println("Objects are equal.");

		else
			System.out.println("Objects are not equal.");

		System.out.println(puck1);
		System.out.println(puck2);

	}

}

///