定义一个平面中的Circle类

定义一个平面中的Circle类

代码：

public class Point {
    double x,y,r;
    public Point() {
        // TODO Auto-generated constructor stub
        this.x=0;
        this.y=0;
        this.r=1;
    }
    public Point(double x, double y, double r) {
        this.x = x;
        this.y = y;
        this.r = r;
    }
    public boolean overlap(Point p) {
        return Math.sqrt((p.x-this.x)*(p.x-this.x)+(p.y-this.y)*(p.y-this.y))<(p.r+this.r);
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Point p1=new Point();
        Point P2=new Point(1,1,0.5);
        Point P3=new Point(3,8,1);
        System.out.println(p1.overlap(P2));
        System.out.println(p1.overlap(P3));
        System.out.println(P2.overlap(P3));
    }

}
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运行结果：

true
false
false