java.sql.Time localTime 可以连续加1秒吗？

Question

在java.time.LocalTime中，有addSeconds()方法。可以用来连续加1秒吗？

LocalTime localTime = Time.valueOf("00:00:00").toLocalTime();
localTime = localTime.plusSeconds(1L);
String output = localTime.toString();
whiteTime = Time.valueOf(output);

我添加了来自 Intellij 的这部分错误消息。

00:00:58
respond to action of white: Black Time
00:00:59
respond to action of white: Black Time
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException
    at java.sql/java.sql.Time.valueOf(Time.java:109)
    at ui.TimerPanel.blackTimerTikTok(TimerPanel.java:71)
    at util.GameModel.actionPerformed(GameModel.java:87)
    at java.desktop/javax.swing.Timer.fireActionPerformed(Timer.java:317)
    at java.desktop/javax.swing.Timer$DoPostEvent.run(Timer.java:249)
    at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
    at java.desktop/java.awt.EventQueue.run(EventQueue.java:721)
    at java.desktop/java.awt.EventQueue.run(EventQueue.java:715)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:389)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

看起来它在达到 00:00:59 时出错了。如何让00:01:00连续数秒？

Answer 1

问题是您正在使用 java.sql.Time.valueOf(String) 并依赖 LocalTime.toString() 格式，该格式可能不会打印秒数，因为：

The format used will be the shortest that outputs the full value of the time where the omitted parts are implied to be zero.

你应该使用 Time.valueOf(LocalTime):

LocalTime localTime = Time.valueOf("00:00:59").toLocalTime();
localTime = localTime.plusSeconds(1);
System.out.println(Time.valueOf(localTime)); // 00:01:00

Answer 2

为了补充@Karol Dowbecki 的回答，如果您需要使用 LocalTime 的字符串表示，您可以使用 DateTimeFormatter 来保持格式一致：

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HH:mm:ss");

String output = localTime.format(formatter);
whiteTime = Time.valueOf(output);

这将在时间滚动时输出 00:01:00 并且不会给你错误

java.sql.Time localTime 可以连续加1秒吗？

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