要避免Java枚舉類型的錯(cuò)誤,可以遵循以下幾點(diǎn)建議:
enum
,并為其指定一個(gè)名稱。在枚舉類型中,定義一組有限的、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;
// ...其他情況
default:
System.out.println("未知的一天");
}
equals()
方法而不是==
操作符。這樣可以確保正確的比較結(jié)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");
}
遵循以上建議,可以有效地避免Java枚舉類型的錯(cuò)誤。