Java 重写 equals + toString 练习

 1 package com.bytezreo.objectclass2;
 2
 3 /**
 4  *
 5  * @Description   重写 equals  +  toString
 6  * @author  Bytezero·zhenglei!      Email:420498246@qq.com
 7  * @version
 8  * @date 2021年9月24日下午3:09:52
 9  * @
10  *
11  */
12 public class CircleTest {
13     public static void main(String[] args) {
14
15         Circle circle1 = new Circle(2.3);
16         Circle circle2 = new Circle(2.31,"while",2.0);
17
18
19         System.out.println("颜色是否相等："+circle1.getColor().equals(circle2.getColor()));
20
21         System.out.println("半径是否相等："+circle1.equals(circle2));
22
23         System.out.println(circle1);
24         System.out.println(circle2.toString());
25
26     }
27
28 }

 1 package com.bytezreo.objectclass2;
 2
 3
 4
 5 public class Circle extends GeometricObject {
 6
 7     private double radius;
 8
 9     public Circle()
10     {
11         super();
12         radius = 1.0;
13
14 //        color = "while";
15 //        weight = 1.0;
16
17     }
18
19     public Circle(double radius) {
20         super();
21         this.radius = radius;
22     }
23
24
25     public Circle(double radius,String  color,double weight) {
26         super(color,weight);
27         this.radius = radius;
28     }
29
30     public double getRadius() {
31         return radius;
32     }
33
34     public void setRadius(double radius) {
35         this.radius = radius;
36     }
37
38     //求圆的面积
39     public double findAre() {
40         return 3.14* radius *radius;
41     }
42
43     //比较半径是否相等
44     @Override
45     public boolean equals(Object obj) {
46
47         if(this == obj) {
48             return true;
49         }
50
51         if(obj instanceof Circle) {
52             Circle c1 = (Circle)obj;
53             return this.radius == c1.getRadius();
54         }
55
56         return false;
57
58     }
59
60     @Override
61     public String toString() {
62         return "Cirlcle [radius=" + radius + "]";
63     }
64
65
66
67 }

 1 package com.bytezreo.objectclass2;
 2
 3 public class GeometricObject {
 4
 5
 6     protected  String color;
 7     protected  double weight;
 8
 9
10
11     public GeometricObject() {
12          super();
13          this.color = "while";
14          this.weight = 1.0;
15     }
16
17
18
19     public GeometricObject(String color, double weight) {
20         super();
21         this.color = color;
22         this.weight = weight;
23     }
24
25
26
27     public String getColor() {
28         return color;
29     }
30
31
32
33     public void setColor(String color) {
34         this.color = color;
35     }
36
37
38
39     public double getWeight() {
40         return weight;
41     }
42
43
44
45     public void setWeight(double weight) {
46         this.weight = weight;
47     }
48
49
50
51
52 }