7. java枚举

时间 2019-11-21

标签 java 枚举栏目 Java 繁體版

原文原文链接

1. 枚举是什么

有的时候一个类的对象是有限且固定的，这种状况下咱们使用枚举类就比较方便app

2. 为何不用静态常量来替代枚举类呢？

3. 经常使用方式

3.1 方式1

枚举类：this

package cn.ali.tencent.ssm.enums;spa

public enum WeekEnum {

       MONDAY("1","星期一"),
   TUESDAY("2","星期二"),
   WEDNESDAY("3","星期三"),
   THURSDAY("4","星期四"),
   FRIDAY("5","星期五"),
   SATURDAY("6","星期六"),
   SUNDAY("7","星期日");

       //调用方法
   private WeekEnum(String code, String desc) {
   this.code = code;
   this.desc = desc;
   }

       //属性及 get方法
       private String code;
       private String desc;
           public String getCode() {
               return code;
           }
           public String getDesc() {
               return desc;
           }



}hibernate

调用：code

   @RequestMapping("/testEnum")
   public void testEnum(){

       String code = WeekEnum.FRIDAY.getCode();
       String desc = WeekEnum.FRIDAY.getDesc();

       System.err.println(code+"----"+desc);
       System.err.println(code+"----"+desc);

   }

3.2 遍历枚举

枚举转中文方式：对象

import lombok.Getter;
import org.hibernate.validator.constraints.br.CNPJ;


public enum BloggerSexEnum {

    /**
     *  博主性别 0未知性别 1男 2女 5女性改成男性 6男性改成女性 9未说明的性别
     **/
    UNKNOWN("0", "unknown ", "未知性别"),
    MAN("1", "man", "男"),
    WOMAN("2", "woman", "女"),
    CHANG_EMAN("5", "womanToMan", "女性改成男性"),
    CHANGE_WOMAN("6", "manToWoman", "男性改成女性"),
    NOT_DESCR("9", "notDescr", "未说明性别");

    @Getter
    private String code;
    @Getter
    private String desc;
    @Getter
    private String cn;

    private BloggerSexEnum(String code, String desc, String cn) {
        this.code = code;
        this.desc = desc;
        this.cn = cn;
    }

    public static String codeOf(String code) {
        switch (code) {
            case "0":
                return BloggerSexEnum.UNKNOWN.getCn();
            case "1":
                return BloggerSexEnum.MAN.getCn();
            case "2":
                return BloggerSexEnum.WOMAN.getCn();
            case "5":
                return BloggerSexEnum.CHANG_EMAN.getCn();
            case "6":
                return BloggerSexEnum.CHANGE_WOMAN.getCn();
            case "9":
                return BloggerSexEnum.NOT_DESCR.getCn();
            default:
                return null;
        }
    }

}