创建 Java 计时器和 TimerTask? [英] Creating a Java Timer and a TimerTask?

问题描述

我是 Java 新手，我正在尝试设置一个简单的计时器，由于使用 JavaScript 和 ActionScript 的经验，我熟悉 set_interval，

I'm new to Java and I'm trying to set a simple timer, I'm familiar with set_interval, because of experience with JavaScript and ActionScript,

我对类还不是很熟悉所以很容易混淆，我知道我需要设置一个新的Timer，然后设置一个TimerTask，但是即使我现在正在查看文档，我也不知道该怎么做..

I'm not so familiar with classes yet so I get confused easily, I understand that I need to set a new Timer, and then set a TimerTask, but I don't get how exactly to do it even though I'm looking at the documentation right now..

所以我创建了一个 Applet，这就是我的 init 方法:

So I created an Applet, and that's my init method:

public void init() {
    TimerTask myTask;
    Timer myTimer;
    myTimer.schedule(myTask,5000);
}

我实际上如何设置任务代码?我想让它做类似的事情

How do I actually set the task code? I wanted it to do something like

g.drawString("Display some text with changing variables here",10,10);

推荐答案

无论你想执行什么，即绘图或 smwhat，只需定义任务并在其中实现代码即可.

Whatever you want to perfom i.e. drawing or smwhat, just define task and implement the code inside it.

import javax.swing.*;
import java.awt.*;
import java.util.Timer;
import java.util.TimerTask;

public class TimerApplet extends JApplet {

  String someText;
  int count = 0;

  public TimerApplet() {
    Timer time = new Timer();
    Сalculate calculate = new Сalculate();
    time.schedule(calculate, 1 * 1000, 1000);
  }

  class Сalculate extends TimerTask {

    @Override
    public void run() {
      count++;
      System.out.println("working.. "+count);
      someText = "Display some text with changing variables here.." +count;
      repaint();

    }
  }

  //This is how do you actually code.
  @Override
  public void paint(Graphics g)//Paint method to display our message
  {
//    super.paint(g);   flickering
    Graphics2D g2d = (Graphics2D)g;
    g2d.setColor(Color.WHITE);
    g2d.fillRect(0, 0, getWidth(), getHeight());
    if (someText != null) {
      g2d.setColor(Color.BLACK);
      g2d.drawString(someText,10,10);
    }

    //.....
  }
}

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