所以我在Java教程上使用了:ProgressBarDemo.java。我将如何继续添加
if 20% {
taskOutput.append(String.format("Completed %d%% of task.\n", task.getProgress()));
if 40% {
taskOutput.append(String.format("Completed %d%% loading region.\n", task.getProgress()));
if 60% {
taskOutput.append(String.format("Completed %d%% loading maps.\n", task.getProgress()));
etc...
包组件;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.beans.*;
import java.util.Random;
public class ProgressBarDemo extends JPanel implements ActionListener, PropertyChangeListener {
private JProgressBar progressBar;
private JButton startButton;
private JTextArea taskOutput;
private Task task;
class Task extends SwingWorker<Void, Void> {
@Override
public Void doInBackground() {
Random random = new Random();
int progress = 0;
setProgress(0);
while (progress < 100) {
try {
Thread.sleep(random.nextInt(1000));
} catch (InterruptedException ignore) {}
progress += random.nextInt(10);
setProgress(Math.min(progress, 100));
}
return null;
}
@Override
public void done() {
Toolkit.getDefaultToolkit().beep();
startButton.setEnabled(true);
setCursor(null);
taskOutput.append("Finished loading WorldPlay!\n");
}
}
public ProgressBarDemo() {
super(new BorderLayout());
startButton = new JButton("Start");
startButton.setActionCommand("start");
startButton.addActionListener(this);
progressBar = new JProgressBar(0, 100);
progressBar.setValue(0);
progressBar.setStringPainted(true);
taskOutput = new JTextArea(5, 20);
taskOutput.setMargin(new Insets(5,5,5,5));
taskOutput.setEditable(false);
JPanel panel = new JPanel();
panel.add(startButton);
panel.add(progressBar);
add(panel, BorderLayout.PAGE_START);
add(new JScrollPane(taskOutput), BorderLayout.CENTER);
setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
}
public void actionPerformed(ActionEvent evt) {
startButton.setEnabled(false);
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
task = new Task();
task.addPropertyChangeListener(this);
task.execute();
}
public void propertyChange(PropertyChangeEvent evt) {
if ("progress" == evt.getPropertyName()) {
int progress = (Integer) evt.getNewValue();
progressBar.setValue(progress);
taskOutput.append(String.format("Completed %d%% of task.\n", task.getProgress()));
}
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("WorldPlay");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JComponent newContentPane = new ProgressBarDemo();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}