2、枚举

 1 /**
 2  * 水果的枚举类
 3  * @author Administrator
 4  *
 5  */
 6 public enum Fruit {
 7     //apple调用有两个参数的构造，构造可以跟匿名内部类
 8     apple(6,3){
 9         public String fname(){
10             return "苹果";
11             }
12         },
13     orange{
14         public String fname(){
15             return "橘子";
16             }
17         },
18     peat{
19         public String fname(){
20             return "梨";
21             }
22         },
23     banana{
24         public String fname(){
25             return "香蕉";
26             }
27         };
28     private int num;//个数
29     private int price;//价格
30     
31 
32     private Fruit() {
33     }
34     private Fruit(int num , int price) {
35         this.num = num;
36         this.price = price;
37     }
38     
39     //抽象方法，返回水果的名字
40     public abstract String fname();
41     
42     public int getNum() {
43         return num;
44     }
45 
46     public void setNum(int num) {
47         this.num = num;
48     }
49 
50     public int getPrice() {
51         return price;
52     }
53 
54     public void setPrice(int price) {
55         this.price = price;
56     }
57 
58 }

 1 public class FruitTest {
 2 
 3     /**
 4      * @param args
 5      */
 6     public static void main(String[] args) {
 7         Fruit apple = Fruit.apple;
 8         System.out.println("有"+apple.getNum()+
 9                 "个"+apple.fname()+
10                 "共"+apple.getPrice()+"元");
11     }
12 
13 }

1 public class Week1 {
2     public static final int MON = 1;
3     public static final int TUS = 2;
4     public static final int WED = 3;
5     public static final int THU = 4;
6     public static final int FIR = 5;
7     public static final int SAT = 6;
8     public static final int SUN = 7;
9 }

 1 public class Test {
 2     public static void main(String[] args) {
 3         Week2 day = Week2.MON;
 4         Test test = new Test();
 5         test.week(day);
 6     }
 7     
 8     public void week(Week2 day){
 9         switch (day) {
10         case MON:
11             System.out.println("星期一，上课");
12             break;
13 
14         default:
15             System.out.println("输入错误！");
16             break;
17         }
18     }
19 }

1 public enum Week2 {
2     //每个枚举常量都相当于一个对象
3     MON,TUS,WED,THU,FIR,SAT,SUN
4 }

 1 public class Test2 {
 2     public enum Fruite{
 3         apple(6,3),orange(4,2),banana(5,4),peat(7,5);
 4         
 5         private Fruite() {
 6         }
 7         
 8         private Fruite(int price , int num) {
 9             this.price = price;
10             this.num = num;
11             
12         }
13 
14         private int price;
15         private int num;
16         
17         public int getNum() {
18             return num;
19         }
20 
21         public void setNum(int num) {
22             this.num = num;
23         }
24 
25         public int getPrice() {
26             return price;
27         }
28 
29         public void setPrice(int price) {
30             this.price = price;
31         }
32     }
33     public static void main(String[] args) {
34         Fruite apple = Fruite.apple;
35         System.out.println("苹果的价格："+apple.price+"苹果的数量："+apple.num);
36     }
37 }