java 枚举类(简单使用)

直接上代码

package com.ou.test;

import com.sun.corba.se.impl.util.SUNVMCID;

public class Enum {
    public static void main(String[] args) {
        Weekday day = Weekday.FIVE;
        System.out.println(day);//直接输出FIVE
    }
}

enum Weekday{
    ONE,TWO,THREE,FOUR,FIVE,SIX,SEVEN;
}

package com.ou.test;
public class Enum {
    public static void main(String[] args) {
        Color color = Color.GREEN;
        switch (color){
            case RED:
                color = Color.GREEN;
                break;
            case YELLOW:
                color = Color.RED;
                break;
            case GREEN:
                color = Color.YELLOW;
                break;
        }
        System.out.println(color);
    }

}
enum Color{
    GREEN, YELLOW, RED
}

package com.ou.test;
public class Enum {
    public static void main(String[] args) {
        System.out.println(Color.getName(3));
        System.out.println(Color.getIndex("绿色"));
    }

}
enum Color{
    RED("红色", 1), GREEN("绿色", 2), BLANK("白色", 3), YELLO("黄色", 4);
    //成员变量
    private String name;
    private int index;
    //构造方法
    Color(String name, int index) {
        this.name=name;
        this.index=index;
    }
    //普通的方法 （根据索引号来找值）
    public static String getName(int index){
        for (Color c:Color.values()){
            if (c.getIndex() == index){
                return c.name;
            }
        }
        return null;
    }
    //普通的方法 （根据值来找索引号）
    public static  int getIndex(String name){
        for (Color c:Color.values()) {
            if (c.getName()==name){
                return c.index;
            }
        }
        return -1;
    }
    //get set
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getIndex() {
        return index;
    }

    public void setIndex(int index) {
        this.index = index;
    }
}