枚举

 1 package enhance;
 2 
 3 /**
 4  * Created by coolkid on 2014/12/20 0020.
 5  */
 6 public class EnumTest {
 7     public static void main(String[] args) {
 8         WeekDay weekDay = WeekDay.FRI;
 9         System.out.println(weekDay);
10         System.out.println(weekDay.name());
11         System.out.println(weekDay.ordinal());//序号
12         System.out.println(weekDay.equals(WeekDay.FRI));
13         System.out.println(WeekDay.valueOf("SUN"));//字符串转枚举变量
14         //迭代枚举类型中的所有元素
15         WeekDay[] weekDays = WeekDay.values();
16         System.out.println("开始迭代");
17         for (WeekDay weekDay1:weekDays){
18             System.out.println(weekDay1.ordinal()+":"+weekDay1);
19         }
20         System.out.println("-------------------------");
21         TrafficLamp trafficLamp = TrafficLamp.GREEN;
22         System.out.println(trafficLamp);
23         System.out.println(trafficLamp.nextLamp());
24     }
25 
26     public enum WeekDay{
27         SUN(1),MON,TUE,WED,THI,FRI,SAT;
28 
29         //构造方法
30         private WeekDay(){}
31         private WeekDay(int day){}
32     }
33 
34     public enum TrafficLamp{
35         RED(30) {
36             @Override
37             public TrafficLamp nextLamp() {
38                 return GREEN;
39             }
40         },
41         GREEN(45) {
42             @Override
43             public TrafficLamp nextLamp() {
44                 return YELLOW;
45             }
46         },
47         YELLOW(5) {
48             @Override
49             public TrafficLamp nextLamp() {
50                 return RED;
51             }
52         };
53         //抽象方法
54         public abstract TrafficLamp nextLamp();
55         private int time;
56         private TrafficLamp(int time){
57             this.time = time;
58         }
59 
60     }
61 }