以Point类为基础，定义一个平面中的Circle类

public class Circle {int radius;int x;int y;public Circle(){radius=1;x=1;y=1;}public Circle(int radius,int x,int y ){this.radius=radius;this.x=x;this.y=y;}public void judgement(Circle C){if((radius==C.radius)&&(x==C.x)&&(y==C.y))System.out.println("c1和c2相重叠");elseSystem.out.println("c1和c2不重叠");}}

import java.util.*;public class TestCircle {public static void main(String[] args) {// TODO Auto-generated method stubCircle c1=new Circle();          //调用无参的构造函数System.out.println("c1圆的原点坐标是:("+c1.x+","+c1.y+"),c2圆的半径是:"+c1.radius);Scanner input=new Scanner(System.in);System.out.println("输入c2圆的半径r:");int r=input.nextInt();System.out.println("输入c2圆的横坐标x:");int x=input.nextInt();System.out.println("输入c2圆的纵坐标y:");int y=input.nextInt();Circle c2=new Circle(r,x,y);System.out.println("c2圆的原点坐标是:("+c2.x+","+c2.y+"),c2圆的半径是:"+c2.radius);c1.judgement(c2);}}