我可以在不使用 Java 中的日历库的情况下将秒数添加到当前日期吗？

Question

我想在Java中获取当前时间，现在我想在时间上面加上15秒。我可以在 java 中使用日历库以外的库 执行此操作吗？

import java.util.Calendar; public class Test { public static void main(String[] args) { Calendar calendar = Calendar.getInstance(); System.out.println("current date = " + calendar.getTime()); calendar.add(Calendar.SECOND, 15); // Add 15 seconds to current date System.out.println("Updated Date = " + calendar.getTime()); } }

Answer 1

确实如此！ java.time package was added because the Calendar and Date classes were insufficient. Something with LocalDateTime 也许吧。喜欢，

LocalDateTime now = LocalDateTime.now();
System.out.println("current date = " + now);
System.out.println("Updated Date = " + now.plusSeconds(15));

Answer 2

可以直接添加到java.util.Date,

    Date now = new Date();
    System.out.println("now : " + now);
    long seconds = now.getTime();
    seconds = seconds + (15 * 1000); //add 15 seconds * 1000 because in millis
    Date then = new Date(seconds);
    System.out.println("then : " + then);

我可以在不使用 Java 中的日历库的情况下将秒数添加到当前日期吗？

Can I add seconds to current date without using Calendar Library in Java?

java

testing

spring

calendar