Java中的枚举类型enum_java 根据枚举常量可以字母数字-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_64086347/article/details/124253718

这篇博客探讨了如何在Java中实现枚举类型，包括自定义类方式和使用内置枚举类型。通过示例展示了如何声明和使用枚举常量，并指出枚举类型的name()方法用于获取枚举名称，ordinal()方法获取枚举位置。同时，文章演示了如何在switch语句中使用枚举，以及在函数调用中处理枚举参数。

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1.自定义类实现枚举类型，使用枚举，指定枚举个数(常量命名大写）

public class Mainseason {
    public static void main(String[]args){
        Season season1= Season.spring;
        Season season2=Season.summer;
        Season season3=Season.fall;
        Season season4=Season.winter;
        System.out.println(season1);
    }
}
public class Season {
    private Season(){};
    public static final Season spring=new Season();
    public static final Season summer=new Season();
    public static final Season fall=new Season();
    public static final Season winter=new Season();

}

//使用函数调用方法，season类不变，如上
public class Mainseason {
    public static void main(String[]args){
      /*  Season season1= Season.spring;
        Season season2=Season.summer;
        Season season3=Season.fall;
        Season season4=Season.winter;
        System.out.println(season1);*/
        test(Season.spring);
    }
    public static void test(Season season){
        if(season==Season.spring){
            System.out.println("春天");
        }//其他季节类似于这种
    }
}

2.枚举类型

1).name是求取其名字

2}ordinal获取其位置

public enum Season {
    spring,summer,fall,winter;//后面如无方法，分号不写
    season(){
    }//该方法调用四次
}
public class Mainseason {
    public static void main(String[]args){
      /*  Season season1= Season.spring;
        Season season2=Season.summer;
        Season season3=Season.fall;
        Season season4=Season.winter;
        System.out.println(season1);*/
        test(Season.spring);
    }
    public static void test(Season season){
        switch(season){
            case spring:
                System.out.println("春天啊");//只有使用枚举类型，才可使用switch语句
                break;
        }
        if(season==Season.spring){
            System.out.println("春天");
        }//其他季节类似于这种
    }
}