java定期執行一個方法

在下面的例子中,我們使用DelayedMethod擴展了線程類。這個簡稱類通過構造函數來指定時間間隔，間隔執行。

import java.applet.;
import java.awt.;
import java.awt.event.;
import java.net.;

public class AnnoyingPopUps extends Applet implements
    ActionListener {
  Button b1, b2;
  DelayedMethod dm;
  int x = 0;
public void init() {
     b1 = new Button("Start Annoying Popops");
     b2 = new Button("Stop Annoying Popops");
     add(b1); add(b2);
     b1.addActionListener(this);b2.addActionListener(this);
     dm = new DelayedMethod(this, 1000);  // 1 second
     dm.start();
     }
public void actionPerformed(ActionEvent ae) {
     if (ae.getSource() == b1) {
        dm.oktorun = true;
        }
     else if(ae.getSource() == b2) {
        dm.oktorun = false;
       }s
     }
public void displayPopup() {
    SimplePopUp d = new SimplePopUp();
    d.show();
    d.setLocation(x , x);
    x = x + 5;
    }
class SimplePopUp extends Dialog  {
    SimplePopUp() {
      super(new Frame(), "annoying popup");
      this.addWindowListener
       (new WindowAdapter() {
           public void windowClosing(WindowEvent e) {
              e.getWindow().dispose();
              }
           }
       );
     }
   }
class DelayedMethod extends Thread {
    AnnoyingPopUps myObj = null;  // customize for your need
    boolean oktorun = false;
    int delay;

DelayedMethod(AnnoyingPopUps myObj) {
  this.myObj = myObj;
  this.delay = 2000;
  }

DelayedMethod(AnnoyingPopUps myObj, int delay) {
  this.myObj = myObj;
  this.delay = delay;
  }

public void run() {
  while (true) {
    try {
      sleep(delay);
      if (oktorun) 
          myObj.displayPopup(); // customize this too!
      } 
    catch (InterruptedException ignored) {}
    }
  }
}    

}</pre>