我如何獲取用戶輸入的日、月和年，然后以 dd-mm-yyyy 格式存盤？除了將它們組合成一個日期并將它們存盤在 startDate 變數中之外，我可以讓一切正常作業。我也不認為 startMonth 可以訪問，因為它在 switch case 中，但我對 java 很陌生并且不確定。
public static void carBookingDates() {
int carNumber;
int startYear;
int startDay;
int startMonth;
int daysInMonth = 0;
int endYear;
int endMonth;
int endDay;
Scanner input = new Scanner(System.in);
System.out.println("To make a booking:");
System.out.printf(" Select a car number from the car list: ");
carNumber = input.nextInt();
System.out.println("");
System.out.println("Enter a booking start date.");
System.out.printf("Please enter the year - for example '2022': ");
startYear = input.nextInt();
while (startYear < 2022 || startYear > 2030) {
System.out.println("Invalid year, please try again: ");
System.out.printf("Please enter the year - for example '2022': ");
startYear = input.nextInt();
}
System.out.printf("Please enter the month - for example '6': ");
startMonth = input.nextInt();
while (startMonth < 1 || startMonth > 12) {
System.out.println("Invalid month, please try again: ");
System.out.printf("Please enter the month - for example '6': ");
startMonth = input.nextInt();
}
switch (startMonth) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
daysInMonth = 31;
break;
case 4:
case 6:
case 9:
case 11:
daysInMonth = 30;
break;
case 2:
if (((startYear % 4 == 0)
&& !(startYear % 100 == 0))
|| (startYear % 400 == 0)) {
daysInMonth = 29;
} else {
daysInMonth = 28;
}
break;
default:
System.out.println("Invalid month.");
break;
}
System.out.printf("Please enter the day number - for"
" example '18': ");
startDay = input.nextInt();
while (startDay > daysInMonth || startDay <= 0) {
System.out.println("Invalid day, plese try again");
System.out.printf("Please enter the day number - for"
" example '18': ");
startDay = input.nextInt();
LocalDate startDate() = LocalDate.parse(startDay "-" StartMonth "-" startYear);
}
}
uj5u.com熱心網友回復：
首先，您可以使用 Java 8 Date Time API 來獲取一個月中的天數，而不是使用手動切換案例來使代碼更具可讀性。
import java.time.YearMonth;
然后：
// 2021 is the year and 2 is the month
int daysInMonth = YearMonth.of(2021,2).lengthOfMonth());
現在以 dd-mm-yyyy 格式形成日期：
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
然后：
// pass your date value here under LocalDate.of method
LocalDate.of(2021,2,16).format(DateTimeFormatter.ofPattern("dd-MM-yyyy"));
轉載請註明出處，本文鏈接：https://www.uj5u.com/shujuku/395395.html