Question

值会在结束时更新，但不会在此过程中更新。我想原因是publish方法位于循环之外。

至于调用PropertyChangeListener，可以通过定义没有extends SwingWorker<Void, Void>的类来实现吗？

为了以另一种方式解决这个问题，我有两个线程位于两个不同的类中。是否可以使用SwingWorker？

在两者之间建立通信

班级申请

import javax.swing.JFrame;

public class Application {
    public static void main(String[] args){
        javax.swing.SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run() {
                JFrame frame = new Progress();
                frame.setSize(200, 300);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.pack();
                frame.setVisible(true);
            }
        });     
    }
}

课程进度

import java.awt.BorderLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;

@SuppressWarnings("serial")
public class Progress extends JFrame{
    private JProgressBar progressbar;

    public Progress(){
        JButton button = new JButton("Run");
        progressbar = new JProgressBar(0, 100);
        progressbar.setValue(0);
        progressbar.setStringPainted(true);
        JPanel panel = new JPanel();
        panel.add(button);
        panel.add(progressbar);
        add(panel, BorderLayout.PAGE_START);

        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent event){
                start();
            }
        });
    }

    private void start(){
        progressbar.setValue(0);

        SwingWorker<Void, Integer> worker = new SwingWorker<Void, Integer>(){

            @Override
            protected Void doInBackground() throws Exception {
                Simulation sim = new Simulation();
                publish(sim.getCount());
                return null;
        }

            @Override
            protected void process(List<Integer> chunks) {
                Integer progress = chunks.get(chunks.size()-1);
                progressbar.setValue(progress);
                progressbar.repaint();
                progressbar.update(progressbar.getGraphics());
            }

            @Override
            protected void done() {
                Toolkit.getDefaultToolkit().beep();
            }
        };
        worker.execute();
    }
}

班级模拟

public class Simulation {
    private int count;

    public Simulation(){
        for(int i=0; i<100; i++){
            count++;
            System.out.println(count);

            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public int getCount(){
        return count;
    }
}

如何在此过程中更新值？

Answer 1

您需要在PropertyChangeListener上实施SwingWorker并听取 Progress 属性更改，然后通过覆盖propertChange()方法更新您的JProgressBar

Here is what you are looking.

希望这有帮助。

使用SwingWorker从另一个类更新线程的进度

1 个答案: