//接口 ShapePara

package d922B;

public interface ShapePara {

int getArea();

int getCircumference();

}

//圆类

package d922B;

public class Circle implements ShapePara {

public double radius;

private double x;

protected double y;

Circle(double r)

{

radius=r;

x=0;

y=0;

}

double getRadius()

{

return radius;

}

void setCenter(double a, double b)

{

x=a;

y=b;

}

void setRadius(double r)

{

radius=r;

}

public int getArea() {

	return(int) (Math.PI*radius*radius);

}

public int getCircumference() {

	return (int) (2*Math.PI*radius);

}

}