java switch与枚举类型如何结合

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."。