要求如下：
- 可以生成具有特定圆心、半径的圆对象
- 提供可以设置成员变量的方法
- 计算一个点（Point）对象是否在圆（Circle）对象内
源代码如下：
import java.util.Scanner;class Point{
//Point点类，用于确定一个点的坐标double x;//x坐标double y;//y坐标public Point(double x,double y) {
this.x = x;this.y = y;}void showPoint() {
//显示点的坐标System.out.print("点的坐标为： ");System.out.println("(" + x + "," + y + ")");}
}public class Circle {
//Circle圆类，用于确定一个圆private double radius;//圆的半径private Point point;//为类Point定义对象point作为圆的圆心坐标public Circle(Point point,double radius) {
this.point = point;this.radius = radius;}void showCircle(){
//显示圆的圆心坐标和半径System.out.print("圆心坐标为： ");System.out.println("(" + point.x + "," + point.y + ")");System.out.print("圆的半径为： ");System.out.println(radius);}void judgement(Point a,Circle b){
//判断点与圆的关系（包括圆外、圆上、圆内）if((a.x-point.x)*(a.x-point.x)+(a.y-point.y)*(a.y-point.y)>(b.radius*b.radius))System.out.print("点在圆外！");else if((a.x-point.x)*(a.x-point.x)+(a.y-point.y)*(a.y-point.y)==(b.radius*b.radius))System.out.print("点在圆上！");else if((a.x-point.x)*(a.x-point.x)+(a.y-point.y)*(a.y-point.y)<(b.radius*b.radius))System.out.print("点在圆内！");} public static void main(String[] args) {
// TODO Auto-generated method stubScanner in = new Scanner(System.in);//键盘输入System.out.print("请输入点的坐标（x坐标、y坐标） ： ");//输入提示语Point point1 = new Point(in.nextDouble(),in.nextDouble());//点的坐标System.out.print("请输入圆的坐标（x坐标、y坐标、半径）： ");//输入提示语Point point2 = new Point(in.nextDouble(),in.nextDouble());//圆心坐标Circle circle1 = new Circle(point2,in.nextDouble());point1.showPoint();circle1.showCircle();circle1.judgement(point1, circle1);in.close();}}