如何在Java Switch中使用枚舉

在Java中，可以使用枚舉類型作為Switch語句的條件。以下是一個示例：

public class EnumSwitchExample {

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

    public static void main(String[] args) {
        Day day = Day.MONDAY;

        switch (day) {
            case MONDAY:
                System.out.println("It's Monday!");
                break;
            case TUESDAY:
                System.out.println("It's Tuesday!");
                break;
            case WEDNESDAY:
                System.out.println("It's Wednesday!");
                break;
            case THURSDAY:
                System.out.println("It's Thursday!");
                break;
            case FRIDAY:
                System.out.println("It's Friday!");
                break;
            case SATURDAY:
                System.out.println("It's Saturday!");
                break;
            case SUNDAY:
                System.out.println("It's Sunday!");
                break;
            default:
                System.out.println("Invalid day!");
                break;
        }
    }
}

在這個示例中，我們定義了一個Day枚舉類型，并在Switch語句中使用它來判斷當前是星期幾。通過將枚舉類型作為Switch語句的條件，可以使代碼更加清晰和易讀，同時避免了使用多個if-else語句。