Java常量枚举定义举例

开发中常量类定义多了很麻烦，不容易记忆，在学习电商项目的get到一种技巧

package com.mmall.common;

import com.google.common.collect.Sets;

import java.util.Set;

/**
 * @author: yangdc
 * @date: 25/4/2020 5:40 PM
 */
public class Const {
    public static final String CURRENT_USER = "currentUser";
    public static final String USERNAME = "username";
    public static final String EMAIL = "email";

    public interface Cart {
        // 购物车中已选中状态
        int CHECKED = 1;
        // 购物车中未选中状态
        int UN_CHECKED = 0;
        String LIMIT_NUM_FAIL = "LIMIT_NUM_FAIL";
        String LIMIT_NUM_SUCCESS = "LIMIT_NUM_SUCCESS";
    }

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

    public interface Role {
        // 普通用户
        int ROLE_CUSTOMER = 0;
        // 管理员
        int ROLE_ADMIN = 1;
    }
    
    public enum ProductStatusEnum {
        ON_SALE(1, "在售"),
        ON_DOWN(2, "下架"),
        ON_DELETE(3, "删除");

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

        public String getValue() {
            return value;
        }

        public void setValue(String value) {
            this.value = value;
        }

        public int getCode() {
            return code;
        }

        public void setCode(int code) {
            this.code = code;
        }
    }
}