疯狂JAVA讲义P167【6.2处理对象 6.2.1打印对象和toString方法】渣渣笔记Ctrl+C+V

例子2：
 1 public class Orc
 2 {
 3        public static class A
 4        {
 5               public String toString()
 6               {
 7                      return "this is A";
 8               }
 9        }
10        public static void main(String[] args)
11        {
12               A obj = new A();
13               System.out.println(obj);
14        }
15 } 　　//输出结果！！

 1 public class Orc
 2 {
 3        public static class A
 4        {
 5               public String getString()
 6               {
 7                      return "this is A";
 8               }
 9        }
10        public static void main(String[] args)
11        {
12               A obj = new A();
13               System.out.println(obj);
14               System.out.println(obj.getString());
15        }
16 }

 1 class Person
 2 {
 3     private String name;
 4     public Person(String name)
 5     {
 6         this.name = name;
 7     }
 8 }
 9 public class PrintObject
10 {
11     public static void main(String[] args)
12     {
13         // 创建一个Person对象，将之赋给p变量
14         Person p = new Person("林冲");
15         // 打印p所引用的Person对象
16         System.out.println(p);
17     }
18 }

 1 class Apple
 2 {
 3     private String color;
 4     private double weight;
 5     public Apple(){    }
 6     //提供有参数的构造器
 7     public Apple(String color , double weight)
 8     {
 9         this.color = color;
10         this.weight = weight;
11     }
12 
13     // color的setter和getter方法
14     public void setColor(String color)
15     {
16         this.color = color;
17     }
18     public String getColor()
19     {
20         return this.color;
21     }
22 
23     // weight的setter和getter方法
24     public void setWeight(double weight)
25     {
26         this.weight = weight;
27     }
28     public double getWeight()
29     {
30         return this.weight;
31     }
33     // 重写toString方法，用于实现Apple对象的"自我描述"
34     public String toString()
35     {
36         return "一个苹果，颜色是：" + color
37             + "，重量是：" + weight;
38     }
39 
40 //    public String toString()
41 //    {
42 //        return "Apple[color=" + color + ",weight=" + weight + "]";
43 //    }
44 
45 }
46 public class ToStringTest
47 {
48     public static void main(String[] args)
49     {
50         Apple a = new Apple("红色" , 2.38);
51         // 打印Apple对象
52         System.out.println(a);
53     }
54 }