以Point类为基础，定义一个平面中的Circle类： 1、编写一个无参的构造函数； 2、编写一个有参的构造函数； 3、在主函数中调用无参的构造函数生成圆的实例c1，调用有参的构造函数生成圆的实例c2

package test;

public class Circle {

int x;

int y;

int r;

public Circle() {

x=3;

y=2;

r=5;

System.out.println(“C1的横坐标是：”+x+”,C1的纵坐标是：”+y+”半径是：”+r);

}

public Circle(int x, int y, int r) {

this.x = x;

this.y = y;

this.r = r;

System.out.println(“C2的横坐标是：”+x+”,C1的纵坐标是：”+y+”半径是：”+r);

}

public void testPoint(Circle c) {

if(c.x==x&&c.y==y&&c.r==r) {

System.out.println(“c1与c2重叠”);

}else {

System.out.println(“c1与c2不重叠”);

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

Circle c1=new Circle();
Circle c2=new Circle(5,6,7);
c1.testPoint(c2);
}

}