我把12小时的时尚时间转换成24小时。 问题是，当秒数为“00”时，它们不会被打印出来，而不管格式化模式如何。 为什么会出现这种情况，如何打印零秒？
public static void main(String[] args) {
String time_1 = "07:05:40PM";
String time_2 = "07:05:00PM";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("hh:mm:ssa");
System.out.println("time_1 " + LocalTime.parse(time_1, formatter));
System.out.println("time_2 " + LocalTime.parse(time_2, formatter));
}
输出为:
time_1 19:05:40
time_2 19:05
使用DateTimeFormatterBuilder#ParseCaseInsensitive以不区分大小写的方式解析时间。 另外，请确保使用适当的格式打印时间。
照做
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
public class Main {
public static void main(final String[] args) {
String time_1 = "07:05:40PM";
String time_2 = "07:05:00PM";
//12-hour format
DateTimeFormatter formatter1 = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.appendPattern("hh:mm:ssa")
.toFormatter();
//24-hour format
DateTimeFormatter formatter2 = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.appendPattern("HH:mm:ss")
.toFormatter();
System.out.println("time_1 " + LocalTime.parse(time_1, formatter1));
System.out.println("time_2 " + LocalTime.parse(time_2, formatter1));
System.out.println("time_2 " + formatter1.format(LocalTime.parse(time_2, formatter1)));
System.out.println("time_2 " + formatter2.format(LocalTime.parse(time_2, formatter1)));
}
}
输出:
time_1 19:05:40
time_2 19:05
time_2 07:05:00pm
time_2 19:05:00
