2

我在使用 JTextField 类的 setText() 方法时遇到问题。简而言之，它在下面的 CounterPanel 类中不起作用。它在 run() 方法中调用，它不会更新文本字段。其余代码运行（可以使用我留下的 println() 语句将其打印到控制台。

这些面板被添加到我也在下面包含的 MainWindow 类中。MainWindow 中有 4 个 CounterPanel，每个都有自己的线程。正如我所说，run() 方法中的其余代码工作正常，所以谁能告诉我哪里出错了？

非常感谢。

import java.awt.Color;

import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

import net.miginfocom.swing.MigLayout;

public class CounterPanel extends JPanel implements Runnable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private JLabel labelOne = new JLabel("Counter 1");
    private JTextField textFieldOne = new JTextField(3);
    private JLabel labelTwo = new JLabel("Counter 2");
    private JTextField textFieldTwo = new JTextField(3);

    private int counter;
    private String counterAsString = Integer.toString(counter);

    public CounterPanel() {
        this.setLayout(new MigLayout());
        this.setBorder(BorderFactory.createLineBorder(Color.black, 1));
        this.add(labelOne);
        this.add(textFieldOne);
        this.add(labelTwo);
        this.add(textFieldTwo);
    }

    @Override
    public void run() {
        while(counter < 100) {
            textFieldOne.setText(counterAsString);
            textFieldTwo.setText(counterAsString);
            System.out.println("Counter 1 = " + counterAsString + ", Counter 2 = " + counterAsString);
            counter++;
        }
        System.out.println("FINISHED");
    }

}




import java.awt.Color;

import javax.swing.*;

import net.miginfocom.swing.MigLayout;

public class MainWindow extends JFrame {

    private CounterPanel panel1 = new CounterPanel();
    private CounterPanel panel2 = new CounterPanel();
    private CounterPanel panel3 = new CounterPanel();
    private CounterPanel panel4 = new CounterPanel();

    private JLabel labelOne = new JLabel("A");
    private JLabel labelTwo = new JLabel("B");
    private JLabel labelThree = new JLabel("C");
    private JLabel labelFour = new JLabel("D");


    public MainWindow() {
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setLayout(new MigLayout());
        this.add(labelOne, "gapright 20px");
        this.getContentPane().add(panel1, "wrap");
        this.add(labelTwo);
        this.getContentPane().add(panel2, "wrap");
        this.add(labelThree);
        this.getContentPane().add(panel3, "wrap");
        this.add(labelFour);
        this.getContentPane().add(panel4);
        this.pack();
        this.setVisible(true);
    }

    public static void main(String[] args) {
        MainWindow window = new MainWindow();
        window.setLocationRelativeTo(null);
        window.runThreads();
    }

    public void runThreads() {
        Thread panelThread1 = new Thread(panel1);
        Thread panelThread2 = new Thread(panel2);
        Thread panelThread3 = new Thread(panel3);
        Thread panelThread4 = new Thread(panel4);

        panelThread1.start();
        panelThread2.start();
        panelThread3.start();
        panelThread4.start();
    }

}
4

2 回答 2

5

问题是：

Swing 组件应该在Event Dispatch ThreadviaSwingUtilities.invokeXXX块上创建和操作。

你不这样做。阅读：

于 2013-01-11T15:07:47.290 回答
0

每次 int 计数器获取时，您的 String counterAsString 都不会更新

while(counter < 100) {
            // put this here
            >>  counterAsString = Integer.toString(counter);
            textFieldOne.setText(counterAsString);
            textFieldTwo.setText(counterAsString);
            System.out.println("Counter 1 = " + counterAsString + ", Counter 2 = " + counterAsString);
            counter++;
}
于 2013-01-11T15:08:01.580 回答