Java 枚举变量解析

abstract class Enum{

public Enum () {
System.out.println("Enum");
}

public static final Enum Sat = new Enum(){
@Override
public Enum nextDay() {
// TODO Auto-generated method stub
return null;
}
};
public static final Enum Sun = new Enum(){
@Override
public Enum nextDay() {
// TODO Auto-generated method stub
return null;
}
};

public abstract Enum nextDay();

//	public Enum nextDay() {
//		if(this == Sat){
//			return Sun;
//		}else{
//			return Sat;
//		}
//
//	}
public String toString() {
return (this == Sat ? "Sat":"Sun");

}

}

/*
* 分析出来的结果:
* ①由此对比我们看出 枚举变量实质应该是个类的实例
* ②枚举变量在使用前，就已经初始化完毕 -->参考模拟Enum
* */

enum Weekday{
FRI{
@Override
public Weekday nextLamp() {
// TODO Auto-generated method stub
return null;
}

},SAT(2){

@Override
public Weekday nextLamp() {
// TODO Auto-generated method stub
return null;
}

};
private int time;
private Weekday(){
System.out.println("First");
}
private Weekday(int time){
System.out.println("Second");
this.time = time;
}
public abstract Weekday nextLamp();
}

public class MyEnum {

public static void main(String[] args) {
// TODO Auto-generated method stub
Enum satEnum = Enum.Sat;
//		System.out.println(satEnum);
Weekday weekday1 = Weekday.SAT;
//	Weekday weekday2 = Weekday.SAT;
//	Weekday weekday3 = Weekday.WED;

}

}