Java Enumeration (枚举类型) (2) -- switch语句

最新推荐文章于 2022-03-17 20:44:25 发布

最新推荐文章于 2022-03-17 20:44:25 发布 · 132 阅读

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本文介绍如何在Java的switch语句中正确使用枚举类型，并通过具体示例展示了不同case标签的写法。注意枚举成员在case中直接使用而不带枚举类名前缀。

当枚举类型用在switch语句中时，语法有一点点特别。看例子：

package other;
import basic.Day;
public class SwitchTest
{
    public static void main(String [] args)
    {
        int FRIDAY = 5;
        System.out.println(FRIDAY);

        Day today = Day.SATURDAY;
        switch(today)
        {
        case FRIDAY:
            System.out.println("Today is " + today.toString().toLowerCase());
            break;
        case SATURDAY:
            System.out.println("Today is " + today.toString().toLowerCase());
            break;
        case SUNDAY:
            System.out.println("Today is " + today.toString().toLowerCase());
            break;
        case MONDAY:
            System.out.println("Today is " + today.toString().toLowerCase());
            break;
        case TUESDAT:
            System.out.println("Today is " + today.toString().toLowerCase());
            break;
        case WEDNESDAY:
            System.out.println("Today is " + today.toString().toLowerCase());
            break;
        case THURSDAY:
            System.out.println("Today is " + today.toString().toLowerCase());
            break;
        default:
            System.out.println("otherday");
        }
    }
}

注意在case标签中，Day不出现，即case Day.FRIDAY是不合法的。而在其他地方出现时则必须用Day.FRIDAY