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我正在用 Java 编写一个应用程序，但我陷入了以下困境：一段时间后，会显示一个 inputDialog(JOptionPane)。因为间隔很短，即 10 秒，如果我延迟与第一个对话交互，那么第二个对话将在我之后立即出现。有没有办法避免这种情况？我认为该程序会等待我的输入。

代码：

Timer timer = new Timer();
    timer.scheduleAtFixedRate(new TimerTask() {
          @Override
          public void run() {
            String task = JOptionPane.showInputDialog(null, "What are you doing now???", "");
          }
        }, 10*1000, 10*1000);
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4 回答 4

2

Timer尝试从内部停止/启动TimerTask

final Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
      @Override
      public void run() {
        timer.stop();
        String task = JOptionPane.showInputDialog(null, "What are you doing now???", "");
        timer.start();
      }
    }, 10*1000, 10*1000);
于 2013-04-14T14:21:21.790 回答
2

如果任务已经在运行，只需检查你的 run 方法，当它运行时，返回。

添加变量

static boolean isRunning = false;

到您的 TimerTask 实现类。然后您的运行方法如下所示：

 public void run() {
     if (isRunning == false) {
         isRunning = true;

         // your code

         isRunning = false;
     }
 }
于 2013-04-14T14:25:22.373 回答
1 
try {
    Thread.sleep(10000);
} catch(InterruptedException ex) {
    Thread.currentThread().interrupt();
}
于 2013-04-14T13:45:48.690 回答
1

[编辑] 下面的代码没有使用“scheduleAtFixedRate”，所以它的结论可能是错误的......（永远不要相信互联网上的那些人：）

【原创】我偏爱和我一样懒的人：

计时器等待。它一次只能运行一个任务。

(** 使用 java-1.8.0-openjdk 测试)

代码（scala，但它正在使用 Java 计时器）：

import java.util.{Timer, TimerTask}

object O {
    val iGen = new AtomicInteger()

    def main(args: Array[String]): Unit = {
        val timer = new Timer()

        val timerTask = new TimerTask {
            override def run(): Unit = {
                val tid = iGen.incrementAndGet()
                println(s"--- task #$tid started")
                Thread sleep(5000)
                println(s"--- task #$tid done")
            }
        }

        timer.schedule(timerTask, 0, 1000)
    }
}

输出：

--- task #1 started
--- task #1 done
--- task #2 started
--- task #2 done
--- task #3 started
--- task #3 done
--- task #4 started
--- task #4 done
--- task #5 started
--- task #5 done
--- task #6 started
--- task #6 done
--- task #7 started
--- task #7 done
--- task #8 started
--- task #8 done
--- task #9 started
--- task #9 done
--- task #10 started
--- task #10 done
--- task #11 started
--- task #11 done
--- task #12 started
--- task #12 done
--- task #13 started
--- task #13 done
--- task #14 started
--- task #14 done
--- task #15 started
--- task #15 done
--- task #16 started
--- task #16 done
--- task #17 started
--- task #17 done
--- task #18 started
--- task #18 done
--- task #19 started
--- task #19 done
--- task #20 started
--- task #20 done
--- task #21 started
--- task #21 done
--- task #22 started
--- task #22 done
--- task #23 started
--- task #23 done
--- task #24 started
--- task #24 done
--- task #25 started
--- task #25 done
--- task #26 started
--- task #26 done
--- task #27 started
--- task #27 done
--- task #28 started
--- task #28 done
--- task #29 started
--- task #29 done
--- task #30 started
--- task #30 done
--- task #31 started
--- task #31 done
--- task #32 started
--- task #32 done
--- task #33 started
--- task #33 done
--- task #34 started
--- task #34 done
--- task #35 started
--- task #35 done
--- task #36 started
--- task #36 done
--- task #37 started
--- task #37 done
--- task #38 started
于 2018-01-18T10:19:44.127 回答