要避免Java枚举类型的错误,可以遵循以下几点建议:
enum
,并为其指定一个名称。在枚举类型中,定义一组有限的、固定的常量。public enum Weekday {
MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY
}
Weekday today = Weekday.MONDAY;
public enum Weekday {
MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY;
private final int dayNumber;
Weekday() {
this.dayNumber = (int) this;
}
public int getDayNumber() {
return dayNumber;
}
}
Weekday today = Weekday.MONDAY;
switch (today) {
case MONDAY:
System.out.println("今天是星期一");
break;
case TUESDAY:
System.out.println("今天是星期二");
break;
// ...其他情况
default:
System.out.println("未知的一天");
}
equals()
方法而不是==
操作符。这样可以确保正确的比较结果。Weekday today = Weekday.MONDAY;
Weekday tomorrow = Weekday.TUESDAY;
if (today.equals(tomorrow)) {
System.out.println("今天和明天是同一天");
} else {
System.out.println("今天和明天不是同一天");
}
遵循以上建议,可以有效地避免Java枚举类型的错误。