该错误通常是由于由于在开关语句中使用了不兼容的数据类型或非法操作,导致标签不可到达而出现的。以下是一些可能的解决方案:
int day = 1;
String dayString;
switch (day) {
case 1:
dayString = "Monday";
break;
case 2:
dayString = "Tuesday";
break;
case 3:
dayString = "Wednesday";
break;
case 4:
dayString = "Thursday";
break;
case 5:
dayString = "Friday";
break;
case 6:
dayString = "Saturday";
break;
case 7:
dayString = "Sunday";
break;
default:
dayString = "Invalid day";
break;
}
2.确保代码中没有重复使用标签。
switch (day) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
case 3:
System.out.println("Wednesday");
break;
case 4:
System.out.println("Thursday");
break;
default:
System.out.println("Invalid day");
break;
case 5: // 错误:标签的位置不当
System.out.println("Friday");
break;
}
switch (day) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
case 3:
System.out.println("Wednesday");
break;
case 4:
System.out.println("Thursday");
break;
default