//枚举就相当于一个类，其中也有定义的构造方法、成员变量、普通方法和抽象法。
package cho1_gaoxinjishu;
//创建java类实现枚举。
public class WeekDay1 {
private WeekDay1(){} //私有构造方法，以免出现重复。
//设置常量，星期一二三四五六日。
public final static WeekDay1 SUN =new WeekDay1();
public final static WeekDay1 MON =new WeekDay1();
public final static WeekDay1 TUE =new WeekDay1();
public final static WeekDay1 WED =new WeekDay1();
public final static WeekDay1 THU =new WeekDay1();
public final static WeekDay1 FIR =new WeekDay1();
public final static WeekDay1 SAT =new WeekDay1();
//定义一个方法
public WeekDay1 nextDay(){
if (this==SUN) {
return MON;
}else if(this==MON){
return TUE;
}else if(this==TUE){
return WED;
}else if(this==WED){
return THU;
}else if(this==THU){
return FIR;
}else if(this==FIR) {
return SAT;
}else {
return SUN;
}
}
public String toString(){
return this==SUN?"SUN":"MON";
}
}
-----------------------------------------------------------
package cho1_gaoxinjishu;
public class EnumTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
WeekDay1 weekDay =WeekDay1.MON;
System.out.println(weekDay.nextDay());
WeekDay weekDay2=WeekDay.FRI;
System.out.println(weekDay2);
//枚举的基本应用（方法）
System.out.println(weekDay2.name());
System.out.println(weekDay2.ordinal());
System.out.println(WeekDay.valueOf("SUN"));
System.out.println(WeekDay.values().length);
}
public enum WeekDay{
SUN,MON,TUE,WED,THU,FRI,SAT;
//枚举的构造方法；
private WeekDay(){System.out.println("frist");}
private WeekDay(int day){System.out.println("second");};
}
//抽象内部内的、带方法的枚举。
public enum TrafficLamp{
RED(30){
public TrafficLamp nextLamp(){
return GREEN;
}
},
GREEN(40){
public TrafficLamp nextLamp(){
return YELLOW;
}
},
YELLOW(5){
public TrafficLamp nextLamp(){
return RED;
}
};
public abstract TrafficLamp nextLamp();
private int time;
private TrafficLamp(int time)//构造方法，参数为时间
{
this.time=time;
}
}
}
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