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    1. package com.atguigu.exercise5;
    2. public class GeometricObject {//几何形状
    3.     //属性
    4.     protected String color;
    5.     protected double weight;
    7.     //构造器
    8.     protected  GeometricObject(){
    10.   this.color = "white";
    11.   this.weight = 1.0;
    12.     }
    14.     protected GeometricObject(String color,double weight){
    16.   this.color = color;
    17.   this.weight = weight;
    18.     }
    20.     //方法
    21.     public String getColor(){
    22.   return color;
    23.     }
    25.     public void setColor(String color){
    26.   this.color = color;
    27.     }
    28.     public double getWeight() {
    29.   return weight;
    30.     }
    31.     public void setWeight(double weight) {
    32.   this.weight = weight;
    33.     }
    34. }
    1. package com.atguigu.exercise5;
    2. public class Circle extends GeometricObject {// 圆形
    3.     // 属性
    4.     private double radius;
    5.     // 构造器
    6.     public Circle() {
    7.   super();
    8.   radius = 1.0;
    9.   // color = "white";
    10.   // weight = 1.0; // super()中已经包含了这两个属性
    11.     }
    12.     public Circle(double radius) {
    13.   super();
    14.   this.radius = radius;
    15.     }
    16.     public Circle(double radius, String color, double weight) {
    17.   super(color, weight);
    18.   this.radius = radius;
    19.     }
    20.     // 方法
    21.     public double getRadius() {
    22.   return radius;
    23.     }
    24.     public void setRadius(double radius) {
    25.   this.radius = radius;
    26.     }
    27.     // 计算圆的面积
    28.     public double findArea() {
    29.   return Math.PI * radius * radius;
    30.     }
    31.     //比较两个圆的半径是否相等，如果相等，返回true
    32.     @Override
    33.     public boolean equals(Object obj) {
    34.   if(this == obj){
    35.       return true;
    36.   }
    37.   if(obj instanceof Circle){
    38.       Circle c = (Circle)obj;
    39.       return this.radius == c.radius;
    40.   }
    41.   return false;
    42.     }
    43.     //输出圆的半径
    44.     @Override
    45.     public String toString() {
    47.   return "Circle [radius =" + radius + "]";
    48.     }
    49. }
    1. package com.atguigu.exercise5;
    2. public class CircleTest {
    3.     public static void main(String[] args) {
    5.   Circle circle1 = new Circle(2.3);
    6.   Circle circle2 = new Circle(2.3, "white", 2.0);
    8.   //判断颜色是否相同
    9.   System.out.println("颜色是否相同："+ circle1.getColor().equals(circle2.getColor()));
    11.   //判断半径是否相同
    12.   System.out.println("半径是否相同："+ circle1.equals(circle2));
    14.   System.out.println(circle1);
    15.   System.out.println(circle2.toString());
    16.     }
    17. }