Question

我想运行一个计时器，说30秒后时间到期，怎么办？有些任务只运行几秒钟然后显示已过期，我该怎么办？

Answer 1

我建议使用java.util.concurrent包中的ScheduledExecutorService，该包具有比JDK中其他Timer实现更丰富的API。

// Create timer service with a single thread.
ScheduledExecutorService timer = Executors.newSingleThreadScheduledExecutor();

// Schedule a one-off task to run in 10 seconds time.
// It is also possible to schedule a repeating task.
timer.schedule(new Callable<Void>() {
  public Void call() {
    System.err.println("Expired!");

    // Return a value here.  If we know we don't require a return value
    // we could submit a Runnable instead of a Callable to the service.
    return null;
  }
}, 10L, TimeUnit.SECONDS);

Answer 2

30秒后调用actionPerformed方法

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.Timer;

public class TimerExample {
    public static void main(String args[]) {
        new JFrame().setVisible( true );
        ActionListener actionListener = new ActionListener() {
            public void actionPerformed(ActionEvent actionEvent) {
                System.out.println( "expired" );
            }
        };
        Timer timer = new Timer( 30000, actionListener );
        timer.start();
    }
}

Answer 3

使用Timer。

如何运行计时器？

3 个答案: