java 枚举

枚举代码：

package com.laoxu.enumeration.Test;


import lombok.Getter;

import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * 枚举示例
 */
public enum  Enumeration {
    ;

    /********************
     * 方式一：简单模式    *
     ********************/
    //固定常量
    public static final String CLOSE = "0";

    public static final String OPEN = "1";

    public static final int SEND_FAIL = 1;

    public static final int SEND_SUCCESS =0;

    public static final TimeUnit DEFAULT_TIME_UNIT = TimeUnit.HOURS;

    public static final Integer UNSTOP = 0;

    public static final Integer STOP = 1;

    //固定列表
    public static List<Integer> MONTH= Arrays.asList(1,2,3,5,6,7,8,9,10,11,12);


    /********************
     * 方式二：级联模式    *
     ********************/
    public enum STATUS {
        ;

        /**
         * 待支付
         */

        public static final String TO_BE_PAID = "1";

        /**
         * 已购买
         */

        public static final String ALREADY_PURCHASED = "2";

        /**
         * 支付超时
         */

        public static final String PAYMENT_TIMEOUT = "3";

        /**
         * 发起退款
         */

        public static final String INITIATE_A_REFUND = "13";

        /**
         * 已退款
         */

        public static final String REFUNDED = "14";

        /**
         * 拒绝退款
         */

        public static final String REFUSAL_OF_REFUND = "15";
    }



    /********************
     * 方式三：枚举类     *
     ********************/
    //商品为例
    public enum Goods{


        PENCEIL(1, "铅笔", "15.00", "能写出字"),
        NOTEBOOK(2, "本子", "30.00", "记笔记"),
        ERASER(3, "橡皮擦", "20.00", "擦除");



        @Getter
        private Integer id;
        @Getter
        private String goodsName;
        @Getter
        private String goodsPrice;
        @Getter
        private String goodsDescription;

        Goods(Integer id, String goodsName, String goodsPrice, String goodsDescription){
            this.id = id;
            this.goodsName = goodsName;
            this.goodsPrice = goodsPrice;
            this.goodsDescription = goodsDescription;
        }


        //根据id获取枚举
        public static Enumeration.Goods getGoods(Integer category) {
            Enumeration.Goods[] values = values();
            return Arrays.stream(values).filter(e -> e.id.equals(category)).findFirst().orElse(null);
        }



    }



}

使用枚举：

package com.laoxu.enumeration.Test;


public class test {

    public static void main(String[] args) {
        method1();
        method2();
        method3();
    }
    //方式一
    public static void method1(){
        System.out.println(Enumeration.CLOSE);
        System.out.println(Enumeration.OPEN);
        System.out.println(Enumeration.SEND_SUCCESS);
        System.out.println(Enumeration.SEND_FAIL);
        System.out.println(Enumeration.DEFAULT_TIME_UNIT);
        System.out.println(Enumeration.UNSTOP);
        System.out.println(Enumeration.STOP);

        System.out.println(Enumeration.MONTH);
    }


    //方式二
    public static void method2(){

        System.out.println(Enumeration.STATUS.TO_BE_PAID);
        System.out.println(Enumeration.STATUS.ALREADY_PURCHASED);
        System.out.println(Enumeration.STATUS.PAYMENT_TIMEOUT);
        System.out.println(Enumeration.STATUS.INITIATE_A_REFUND);
        System.out.println(Enumeration.STATUS.REFUNDED);
        System.out.println(Enumeration.STATUS.REFUSAL_OF_REFUND);
    }



    //方式三
    public static void method3(){

        System.out.println(Enumeration.Goods.PENCEIL);
        System.out.println(Enumeration.Goods.PENCEIL.getId());
        System.out.println(Enumeration.Goods.PENCEIL.getGoodsName());
        System.out.println(Enumeration.Goods.PENCEIL.getGoodsPrice());
        System.out.println(Enumeration.Goods.PENCEIL.getGoodsDescription());


        System.out.println(Enumeration.Goods.NOTEBOOK);
        System.out.println(Enumeration.Goods.NOTEBOOK.getId());
        System.out.println(Enumeration.Goods.NOTEBOOK.getGoodsName());
        System.out.println(Enumeration.Goods.NOTEBOOK.getGoodsPrice());
        System.out.println(Enumeration.Goods.NOTEBOOK.getGoodsDescription());

        System.out.println(Enumeration.Goods.ERASER);
        System.out.println(Enumeration.Goods.ERASER.getId());
        System.out.println(Enumeration.Goods.ERASER.getGoodsName());
        System.out.println(Enumeration.Goods.ERASER.getGoodsPrice());
        System.out.println(Enumeration.Goods.ERASER.getGoodsDescription());


        System.out.println(Enumeration.Goods.getGoods(1));

    }




}