java10/12今日总结

  1 public class Zoo 
  2 {
  3 
  4     public static void main(String args[])
  5     {
  6 
  7         Feeder f = new Feeder("小李");
  8 
  9         // 饲养员小李喂养一只狮子
 10 
 11         f.feedLion(new Lion());
 12 
 13         // 饲养员小李喂养十只猴子
 14 
 15         for (int i = 0; i < 10; i++)
 16          {
 17 
 18             f.feedMonkey(new Monkey());
 19 
 20         }
 21         
 22         // 饲养员小李喂养5只鸽子
 23 
 24         for (int i = 0; i < 5; i++)
 25          {
 26 
 27             f.feedPigeon(new Pigeon());
 28 
 29         }
 30     
 31     }
 32 
 33 }
 34 
 35 
 36 class Feeder 
 37 {
 38 
 39 
 40     public String name;
 41 
 42 
 43     public Feeder(String name)
 44     {
 45 
 46         this.name = name;
 47 
 48     }
 49 
 50     
 51     public void feedLion(Lion l)
 52     {
 53 
 54         l.eat();
 55 
 56     }
 57 
 58     
 59     public void feedPigeon(Pigeon p)
 60     {
 61 
 62         p.eat();
 63 
 64     }
 65 
 66     
 67     public void feedMonkey(Monkey m)
 68     {
 69 
 70         m.eat();
 71 
 72     }
 73 
 74 }
 75 
 76 
 77 class Lion
 78 {
 79 
 80 
 81     public void eat() 
 82     {
 83 
 84         System.out.println("我不吃肉谁敢吃肉！");
 85 
 86     }
 87 
 88 }
 89 
 90 
 91 class Monkey 
 92 {
 93 
 94     public void eat() 
 95     {
 96 
 97         System.out.println("我什么都吃，尤其喜欢香蕉。");
 98 
 99     }
100 
101 }
102 
103 
104 class Pigeon 
105 {
106 
107 
108     public void eat() 
109     {
110 
111         System.out.println("我要减肥，所以每天只吃一点大米。");
112 
113     }
114 
115 }

动物园代码

 1 public final class Address
 2 {
 3     private final String detail;
 4     private final String postCode;
 5 
 6     //在构造方法里初始化两个实例属性
 7     public Address()
 8     {
 9         this.detail = "";
10         this.postCode = "";
11 
12     }
13     public Address(String detail , String postCode)
14     {
15         this.detail = detail;
16         this.postCode = postCode;
17     }
18     //仅为两个实例属性提供getter方法
19     public String getDetail()
20     {
21          return this.detail;
22     }
23 
24     public String getPostCode()
25     {
26          return this.postCode;
27     }
28     //重写equals方法，判断两个对象是否相等。
29     public boolean equals(Object obj)
30     {
31         if (obj instanceof Address)
32         {
33             Address ad = (Address)obj;
34             if (this.getDetail().equals(ad.getDetail()) && this.getPostCode().equals(ad.getPostCode()))
35             {
36                 return true;
37             }
38         }
39         return false;
40     }
41     public int hashCode()
42     {
43         return detail.hashCode() + postCode.hashCode();
44     }
45 }