枚举类的使用

package cn.com.duiba.project.q2.p20210610.webank.enums;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

import java.util.Map;

public enum LimitCycleTypeEnum {

    UNLIMITED(0, "无限制"),
    ACTIVITY_CYCLE(1, "活动周期内限制"),
    DAILY(2, "每日限制"),
    ;

    private int code;
    private String desc;

    LimitCycleTypeEnum(int code, String desc) {
        this.code = code;
        this.desc = desc;
    }
		//ImmutableMap特点：创建之后不可修改，在创建时为其赋予值
    private static final ImmutableMap ALL_MAP;

    static {
        Map tmpMap = Maps.newHashMap();
      	//LimitCycleTypeEnum.values():此方法可以将枚举类转变为一个枚举类型的数组
        for (LimitCycleTypeEnum typeEnum : LimitCycleTypeEnum.values()) {
          	//key：枚举值的code		
          	//value:枚举值的名称
            tmpMap.put(typeEnum.getCode(), typeEnum);
        }
      	
        ALL_MAP = ImmutableMap.copyOf(tmpMap);
    }

    public static LimitCycleTypeEnum getByCode(Integer code) {
        return ALL_MAP.get(code);
    }

    public int getCode() {
        return code;
    }

    public String getDesc() {
        return desc;
    }
}