定义一个平面中的Circle类：

package text3;

public class Circle {
int x;
int y;
int r;
Circle(){//无参的构造方法
	x=1;
	y=1;
	r=1;
	System.out.println("圆c1的圆心为:"+"("+x+","+y+")"+"半径为"+r);
}
Circle(int xx,int yy,int rr){//有参的构造方法
	x=xx;
	y=yy;
	r=rr;
	System.out.println("圆c2的圆心为:"+"("+x+","+y+")"+"半径为"+r);
}
void circleSame(Circle c) {
	if(x==c.x&&y==c.y&&r==c.r)
		System.out.println("两个圆重叠");
	else
		System.out.println("两个圆不重叠");
		
}
}
package text3;
import java.util.Scanner;
public class text3 {
	public static void main(String[] args) {
		 Scanner sc=new Scanner(System.in); 
		 int xx=sc.nextInt(); //输入圆的圆心坐标和半径
		 int yy=sc.nextInt();
		 int rr=sc.nextInt();
		 Circle c1=new Circle(); //用Circle类创建对象c1
		 Circle c2=new Circle(xx,yy,rr); //创建对象c2
		 c1.circleSame(c2); //对象c1调用circleSame方法
	}

}