枚举的书写，超级无敌重点（枚举的作用）

package com.mmall.common;

import com.google.common.collect.Sets;

import java.util.Set;

/**
 */
public class Const {

    public static final String CURRENT_USER = "currentUser";

    public static final String EMAIL = "email";
    public static final String USERNAME = "username";

    public interface ProductListOrderBy{
        Set<String> PRICE_ASC_DESC = Sets.newHashSet("price_desc","price_asc");
    }

    public interface Cart{
        int CHECKED = 1;//即购物车选中状态
        int UN_CHECKED = 0;//购物车中未选中状态

        String LIMIT_NUM_FAIL = "LIMIT_NUM_FAIL";
        String LIMIT_NUM_SUCCESS = "LIMIT_NUM_SUCCESS";
    }

    public interface Role{
        int ROLE_CUSTOMER = 0; //普通用户
        int ROLE_ADMIN = 1;//管理员
    }

    public enum ProductStatusEnum{
        ON_SALE(1,"在线");
        private String value;
        private int code;
        ProductStatusEnum(int code,String value){
            this.code = code;
            this.value = value;
        }

        public String getValue() {
            return value;
        }

        public int getCode() {
            return code;
        }
    }


    public enum OrderStatusEnum{
        CANCELED(0,"已取消"),
        NO_PAY(10,"未支付"),
        PAID(20,"已付款"),
        SHIPPED(40,"已发货"),
        ORDER_SUCCESS(50,"订单完成"),
        ORDER_CLOSE(60,"订单关闭");


        OrderStatusEnum(int code,String value){
            this.code = code;
            this.value = value;
        }
        private String value;
        private int code;

        public String getValue() {
            return value;
        }

        public int getCode() {
            return code;
        }

        public static OrderStatusEnum codeOf(int code){
            for(OrderStatusEnum orderStatusEnum : values()){
                if(orderStatusEnum.getCode() == code){
                    return orderStatusEnum;
                }
            }
            throw new RuntimeException("么有找到对应的枚举");
        }
    }
    public interface  AlipayCallback{
        String TRADE_STATUS_WAIT_BUYER_PAY = "WAIT_BUYER_PAY";
        String TRADE_STATUS_TRADE_SUCCESS = "TRADE_SUCCESS";

        String RESPONSE_SUCCESS = "success";
        String RESPONSE_FAILED = "failed";
    }



    public enum PayPlatformEnum{
        ALIPAY(1,"支付宝");

        PayPlatformEnum(int code,String value){
            this.code = code;
            this.value = value;
        }
        private String value;
        private int code;

        public String getValue() {
            return value;
        }

        public int getCode() {
            return code;
        }
    }

    public enum PaymentTypeEnum{
        ONLINE_PAY(1,"在线支付");

        PaymentTypeEnum(int code,String value){
            this.code = code;
            this.value = value;
        }
        private String value;
        private int code;

        public String getValue() {
            return value;
        }

        public int getCode() {
            return code;
        }


        public static PaymentTypeEnum codeOf(int code){
            for(PaymentTypeEnum paymentTypeEnum : values()){
                if(paymentTypeEnum.getCode() == code){
                    return paymentTypeEnum;
                }
            }
            throw new RuntimeException("么有找到对应的枚举");
        }

    }




}

public enum PaymentTypeEnum{
    ONLINE_PAY(1,"在线支付");

    PaymentTypeEnum(int code,String value){
        this.code = code;
        this.value = value;
    }
    private String value;
    private int code;

    public String getValue() {
        return value;
    }

    public int getCode() {
        return code;
    }

//将数据库的数字对应的汉字返回到前端去
    public static PaymentTypeEnum codeOf(int code){
        for(PaymentTypeEnum paymentTypeEnum : values()){
            if(paymentTypeEnum.getCode() == code){
                return paymentTypeEnum;
            }
        }
        throw new RuntimeException("么有找到对应的枚举");
    }

}