Java——枚举

大风起兮云飞扬丶2026-10-27 15:07

Java------枚举

enum 是一种有确定取值区间的数据类型，本质上是一种类，具有简洁、高效安全、方便等特点枚举的值被约束到一个特定的范围，只能从该范围中取值。

简洁版

java 复制代码

enum WeekEnum {
    MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY
}

构造器版

java 复制代码

public enum WeekEnum {
    MONDAY(0, "周一"),// 注意是逗号，这相当于在调构造器
    TUESDAY(1, "周二"),
    WEDNESDAY(2, "周三"),
    THURSDAY(3, "周四"),
    FRIDAY(4, "周五"),
    SATURDAY(5, "周六"),
    SUNDAY(6, "周七");

    private Integer code;
    private String value;

    WeekEnum(Integer code, String value) {
        this.code = code;
        this.value = value;

    }

    public String getValue() {
        return this.value;
    }

    public Integer getCode() {
        return this.code;
    }

    @Override
    public String toString() {
        return "WeekEnum{" +
                "code=" + code +
                ", value='" + value + '\'' +
                '}';
    }
}

使用

java 复制代码

public class Main {
    public static void main(String[] args) {
        System.out.println(WeekEnum.MONDAY);
        System.out.println(WeekEnum.MONDAY.getCode());
        System.out.println(WeekEnum.MONDAY.getValue());
    }
}