學習原博 https://blog.csdn.net/qq_27093465/article/details/52180865

package com.example.demo.bean.baseBean;


import org.springframework.util.StringUtils;

import java.util.Arrays;

/**
 * @Author: 
 * @Date: 2018/12/21 09:06
 * @Description:
 */
public class constructionBean {

    /**
     * 應用型別列舉
     */
    enum AppTypeEnum {
        ANDROID, IOS, WINDOWS
    }

    /**
     * 顏色列舉
     */
    enum ColorEnmu {
        RED, GREEN, YELLOW
    }

    /**
     * 訊號燈轉換
     *
     * @param color
     * @return
     */
    public static ColorEnmu changTraficColor(ColorEnmu color) {
        switch (color) {
            case RED:
                color = ColorEnmu.GREEN;
                break;
            case GREEN:
                color = ColorEnmu.YELLOW;
                break;
            case YELLOW:
                color = ColorEnmu.RED;
                break;
        }
        return color;
    }

    /**
     * 班級列舉值
     */
    public enum ClassEnum {
        CLASS_ENUM1(1, "一班"),
        CLASS_ENUM2(2, "二班"),
        CLASS_ENUM3(3, "三班");

        private int index;
        private String name;

        ClassEnum(int index, String name) {
            this.index = index;
            this.name = name;
        }

        public static String getNameByIndex(int a) {
            String name = null;

            for (ClassEnum classEnum : ClassEnum.values()) {
                if (a == classEnum.getIndex()) {
                    return classEnum.getName();

                }
            }
            return name;
        }

        public int getIndex() {
            return index;
        }

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

        public String getName() {
            return name;
        }

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

    public static void main(String[] args) {

//        for (AppTypeEnum a :AppTypeEnum.values()) {
//            System.out.println(a);
//        }

//        System.out.println(AppTypeEnum.valueOf("IOS"));

//        ColorEnmu colorEnmu = ColorEnmu.RED;
//        for (int i=1;i<10;i++){
//            ColorEnmu colorEnmuTemp = colorEnmu;
//            colorEnmu = changTraficColor(colorEnmu);
//            System.out.println("第"+i+"次燈色由【"+colorEnmuTemp+"】變成【"+colorEnmu+"】");
//        }

        int c = 4;
        System.out.println(ClassEnum.getNameByIndex(c));

    }


}