Enum入门【原】

package com.bobo.www.cxf.impl;  

public enum Traffic {  

    Red(1), Green(2), Yellow(3);//必须最前面  

    private int flag = 0;  

    private Traffic() {
        System.out.println("init");
    }  

    private Traffic(int flag) {
        this.flag = flag;
    }  

    public String toString() {
        return String.valueOf(flag);
    };  

} 

public class doit {
    public static void main(String[] args) {
        Traffic t1 = Traffic.Green;
        for(Traffic t : Traffic.values()){
            System.out.println(t);
        }
        System.out.println();
    }
}