java--继承之--点，面，圆柱

/*烟台大学计算机学院学生    
*All right reserved.    
*文件名称:java--继承之--点，面，圆柱
*作者：杨飞    
*完成日期：2014年10月2日    
*版本号：v1.0    
*对任务及求解方法的描述部分:java--继承之--点，面，圆柱
*我的程序：*/ 
public class Point {
	private double x;
	private double y;
	public Point()
	{
		
	}
	public Point(double x ,double y)
	{
		this.x = x;
		this.y = y;
		
	}
	public double getX() {
		return x;
	}
	public void setXY(double x,double y) {
		this.x = x;
		this.y = y;  
		
	}
	public double getY() {
		return y;
	}
}
class Circle extends Point
{
	private double r;
     public Circle()
     {
    	 
     }
	public Circle(double x,double y,double r)
	{
		super(x,y);
		this.r = r;
	}
	public double getR() {
		return r;
	}

	public void setR(double r) {
		this.r = r;
	}
	public double area()
	{
		
		return 3.1415926*r*r;
	}
    
}
class Cylinder extends Circle
{
	private double h;

	public Cylinder()
	{
		
	}
	public Cylinder(double x,double y,double r,double h)
	{
		super(x,y,r);
		this.h=h;
	}
	public double getH() {
		return h;
	}

	public void setH(double h) {
		this.h = h;
	}
	public double tiji()
	{
		return area()*h;
		
	}
	

}
class test
{
	public static void main(String []args)
	{
		Cylinder s=new Cylinder(2,2,4,2);
		System.out.println("轴心坐标  （"+s.getX()+","+s.getY()+")");
		System.out.println("半径是："+s.getR());
		System.out.println("圆的面积是："+s.area());
		System.out.println("圆柱的高是："+s.getH());
		System.out.println("圆柱体积是："+s.tiji());
	}
	
}

运行结果：