Java 扫描程序未将字符串正确存储为已解析的LocalDateTime
当我从扫描器中获取字符串变量并以“yyyy-MM-dd-HH:MM”格式将其解析为LocalDateTime时,扫描器保存了输入(即2020-10-12 14:30),没有时间。我相信时间会节省到下一个变量中。但是,如果输入2020-10-1214:30而不带空格,则会正确保存变量 下面是我的构造函数,在这里创建对象,并将字符串解析为localdatetime对象Java 扫描程序未将字符串正确存储为已解析的LocalDateTime,java,localdatetime,Java,Localdatetime,当我从扫描器中获取字符串变量并以“yyyy-MM-dd-HH:MM”格式将其解析为LocalDateTime时,扫描器保存了输入(即2020-10-12 14:30),没有时间。我相信时间会节省到下一个变量中。但是,如果输入2020-10-1214:30而不带空格,则会正确保存变量 下面是我的构造函数,在这里创建对象,并将字符串解析为localdatetime对象 public computerbooking(String strDAte, String ReturnDate,String co
public computerbooking(String strDAte, String ReturnDate,String computerType,String AssetTag,String StudentId ){
counter++;
this.bookingId = "Book"+counter;
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
bookingDateAndTime = bookingDateAndTime.parse(strDAte,formatter);
returnDateAndTime = returnDateAndTime.parse(ReturnDate,formatter);
this.computerType = computerType;
this.AssetTag = AssetTag;
this.StudentId = StudentId;
}
如何指示扫描仪不读取日期和时间之间的空格以正确保存
LocalDateTime#parse
是一个静态
函数。使用LocalDateTime.parse(strDate,格式化程序)
而不是bookingDateAndTime.parse(strDate,格式化程序)
Scanner#nextLine
扫描整行输入。如果您使用的是Scanner#next
,则它最多只能扫描2020-10-12
,即在2020-10-12
之后遇到空白字符时,它将立即停止扫描import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Scanner;
class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter date and time: ");
String strDate = scanner.nextLine();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("uuuu-MM-dd HH:mm");
LocalDateTime bookingDateAndTime = LocalDateTime.parse(strDate, formatter);
System.out.println(bookingDateAndTime);
// A custom format
String formatted = bookingDateAndTime.format(DateTimeFormatter.ofPattern("MMM dd uuuu hh:mm a"));
System.out.println(formatted);
}
}
Enter date and time: 2020-10-12 14:30
2020-10-12T14:30
Oct 12 2020 02:30 pm
运行示例:
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Scanner;
class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter date and time: ");
String strDate = scanner.nextLine();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("uuuu-MM-dd HH:mm");
LocalDateTime bookingDateAndTime = LocalDateTime.parse(strDate, formatter);
System.out.println(bookingDateAndTime);
// A custom format
String formatted = bookingDateAndTime.format(DateTimeFormatter.ofPattern("MMM dd uuuu hh:mm a"));
System.out.println(formatted);
}
}
Enter date and time: 2020-10-12 14:30
2020-10-12T14:30
Oct 12 2020 02:30 pm
如果不看到使用
扫描仪的代码,就很难回答问题