枚举Enum使用

package com.wzy.enumt;

public enum Citys {
    //值为静态常量，每一个常量都是一个实例
    BEIJING("北京"),
    SHANGHAI("上海"),
    HANGZHOU("杭州"),
    XIANGGANG("香港");
    
    private String value;
    
    Citys(){
        System.out.println("构造");
    }
        
    Citys(String value){
        this.value = value;
    }
    public String getValue() {
        return value;
    }

}

public static void main(String[] args) {
        System.out.println(Citys.BEIJING);//BEIJING
        System.out.println(Citys.BEIJING.name());//BEIJING
        System.out.println(Citys.BEIJING.toString());//BEIJING
        System.out.println(Citys.BEIJING.ordinal());//0位置坐标
        System.out.println(Citys.BEIJING.getValue());//北京
        
        System.out.println(Enum.valueOf(Citys.class, "HANGZHOU").getValue());//在Citys.class中查找HANGZHOU属性，并得到值
    }