java - 从线程更新 Swing GUI

Question

我有一个带有一些线程的简单应用程序，我需要从某个线程更新 SWING GUI(我正在使用 Netbeans)。

这是我需要更新的主表单:

public class mainForm extends javax.swing.JFrame {
private gameControll obj;
  public mainForm() {

    initComponents();
}
 public void runAuto(){
ThreadTest th1 = new ThreadTest(1, 1, obj);
ThreadTest th8 = new ThreadTest(8, 95000, obj);
ThreadTest th2 = new ThreadTest(2, 100000, obj);
ThreadTest th3 = new ThreadTest(3, 120000, obj);
ThreadTest th4 = new ThreadTest(4, 140000, obj);
ThreadTest th22 = new ThreadTest(22, 1000, obj);

Thread thread1 = new Thread(th1);
Thread thread2 = new Thread(th2);
Thread thread3 = new Thread(th3);
Thread thread4 = new Thread(th4);
Thread thread22 = new Thread(th22);
Thread thread8 = new Thread(th8);

thread1.start();
thread2.start();
thread3.start();
thread4.start();
thread22.start();
thread8.start();

}
public static void main(String args[]) {

SwingUtilities.invokeLater(new Runnable() {
  public void run() {
    mainForm app = new mainForm();
    app.setVisible(true);
        }
    });
}
    private javax.swing.JButton jButton1;
private javax.swing.JButton jButton10;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JSeparator jSeparator1;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField pathtbox;                 
}

现在我有一些线程:

public class ThreadTest implements Runnable {
public static mainForm main = new mainForm();
private final int functionNumber;
private final int time2start;
public ThreadTest(int functionNumber, int time2start, gameControll obj){
this.functionNumber = functionNumber;
this.time2start = time2start;

}

   @Override
   public void run(){

try{Thread.sleep(time2start);}catch(Exception ex){}//Time Delay before executing methods
switch(functionNumber){
    case 1:
//System.out.println("case 1");
        obj.runFirst();
        break;
    case 2:
   //     System.out.println("case 2");
        obj.runSecond();

        break;
    case 3:

{
    try {
        obj.runThird();
    } catch (IOException ex) {
        Logger.getLogger(ThreadTest.class.getName()).log(Level.SEVERE, null, ex);
    }
}
        break;
...

在其他类(class)中我有:

  public void runFirst(){
   System.out.println("I need to show this text on jlabel5");
   }

代码的每个部分都位于不同的文件(类)中。我如何在这里实现 Swing 工作程序以便能够在我的主 GUI 表单上显示文本？

Answer 1

How would i implement Swing worker here to be able to show text on my main GUI form?

根据您的代码中观察到的功能列表:

• 您希望在执行任务时有一个初始延迟。
• 任务应按顺序执行。
• 任务旨在更新 GUI 组件，但不执行繁重的任务(即:设置标签的文本)。

国际海事组织Swing Timer在这种情况下，比 Swing worker 更适合。您可以定义多个可以访问 MainForm 类实例的计时器，以执行所需的操作并更新完全相同的表单(现在)，而不是使用实现 Runnable 接口(interface)的类您创建一个新表单作为 ThreadTest 类的类成员)。例如:

    Timer timer1 = new Timer(1, new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            mainFrame.runFirst();
        }
    });
    timer1.setRepeats(false);

    Timer timer2 = new Timer(1000, new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            mainFrame.runSecond();
        }
    });
    timer2.setRepeats(false);
    ...
    timer1.start();
    timer2.start();
    ...

其中 MainFrame#runFirst() 应如下所示:

public void runFirst() {
    jlabel5.setText("Label#5 updated from Timer!");
}