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public void setString(String s)

設置進度字符串的值。默認情況下，此字符串為 null，隱含使用簡單百分比字符串的內置行為62616964757a686964616fe78988e69d8331333264623135。如果已提供自定義進度字符串并要轉換回內置狀態，將字符串設置回 null 即可。

僅當 isStringPainted 方法返回 true 時繪制進度字符串。

參數：

s - 進度字符串的值

另請參見：

getString(), setStringPainted(boolean), isStringPainted()

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 {

/*

* Main task. Executed in background thread.

*/

@Override

public Void doInBackground() {

Random random = new Random();

int progress = 0;

//Initialize progress property.

setProgress(0);

while (progress < 100) {

//Sleep for up to one second.

try {

Thread.sleep(random.nextInt(1000));

} catch (InterruptedException ignore) {}

//Make random progress.

progress += random.nextInt(10);

setProgress(Math.min(progress, 100));

}

return null;

}

/*

* Executed in event dispatching thread

*/

@Override

public void done() {

Toolkit.getDefaultToolkit().beep();

startButton.setEnabled(true);

setCursor(null); //turn off the wait cursor

taskOutput.append("Done!\n");

}

}

public ProgressBarDemo() {

super(new BorderLayout());

//Create the demo's UI.

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));

}

/**

* Invoked when the user presses the start button.

*/

public void actionPerformed(ActionEvent evt) {

startButton.setEnabled(false);

setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));

//Instances of javax.swing.SwingWorker are not reusuable, so

//we create new instances as needed.

task = new Task();

task.addPropertyChangeListener(this);

task.execute();

}

/**

* Invoked when task's progress property changes.

*/

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()));

}

}

/**

* Create the GUI and show it. As with all GUI code, this must run

* on the event-dispatching thread.

*/

private static void createAndShowGUI() {

//Create and set up the window.

JFrame frame = new JFrame("ProgressBarDemo");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//Create and set up the content pane.

JComponent newContentPane = new ProgressBarDemo();

newContentPane.setOpaque(true); //content panes must be opaque

frame.setContentPane(newContentPane);

//Display the window.

frame.pack();

frame.setVisible(true);

}

public static void main(String[] args) {

//Schedule a job for the event-dispatching thread:

//creating and showing this application's GUI.

javax.swing.SwingUtilities.invokeLater(new Runnable() {

public void run() {

createAndShowGUI();

}

});

}

}

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