java switch与枚举类型如何结合-开发者知识库平台

java switch与枚举类型如何结合

Java

335

2024/9/20 21:31:32

栏目: 编程语言

在Java中，你可以将switch语句与枚举类型结合使用，以便根据枚举值执行不同的操作。以下是一个示例，展示了如何将switch语句与枚举类型结合使用：

首先，定义一个枚举类型：

public enum DayOfWeek {
    MONDAY,
    TUESDAY,
    WEDNESDAY,
    THURSDAY,
    FRIDAY,
    SATURDAY,
    SUNDAY
}

接下来，创建一个方法，该方法接受DayOfWeek枚举值作为参数，并使用switch语句根据枚举值执行不同的操作：

public class SwitchWithEnum {
    public static void main(String[] args) {
        DayOfWeek day = DayOfWeek.MONDAY;
        performActions(day);
    }

    public static void performActions(DayOfWeek day) {
        switch (day) {
            case MONDAY:
                System.out.println("Monday is the first day of the week.");
                break;
            case TUESDAY:
                System.out.println("Tuesday is the second day of the week.");
                break;
            case WEDNESDAY:
                System.out.println("Wednesday is the third day of the week.");
                break;
            case THURSDAY:
                System.out.println("Thursday is the fourth day of the week.");
                break;
            case FRIDAY:
                System.out.println("Friday is the fifth day of the week.");
                break;
            case SATURDAY:
                System.out.println("Saturday is the sixth day of the week.");
                break;
            case SUNDAY:
                System.out.println("Sunday is the seventh day of the week.");
                break;
            default:
                System.out.println("Invalid day.");
        }
    }
}

在这个示例中，performActions方法接受一个DayOfWeek枚举值作为参数。然后，使用switch语句根据枚举值执行不同的操作。当传入的枚举值为MONDAY时，输出"Monday is the first day of the week.“。当传入的枚举值为SATURDAY时，输出"Saturday is the sixth day of the week.”。对于其他枚举值，输出"Invalid day."。

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java switch与枚举类型如何结合

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