1、import java.awt.event.*;public class Test extends JApplet private JProgressBar progressBars = new JProgressBar(),new JProgressBar();public void init() Container contentPane = getContentPane();contentPane.setLayout(new FlowLayout();for(int i=0; i progressBars.length; +i) JProgressBar pb = progressBar
2、si;if(i = 0) pb.setStringPainted(true);pb.setString(Custom String);if(i = 1) pb.setOrientation(JProgressBar.VERTICAL);pb.setForeground(Color.yellow);pb.setMaximum(1000);pb.setValue(50);pb.setBorder(BorderFactory.createRaisedBevelBorder();if(i = 2) pb.setForeground(Color.blue);pb.setBorderPainted(fal
3、se);if(i = 3) pb.setForeground(Color.red);pb.setValue(90);BorderFactory.createEtchedBorder();contentPane.add(pb);这个小应用程序创建了一组进度条,并为每个进度条设置了各种不同的属性,从而产生了图11-1中示出的各种不同配置。11.1.1 进度条与线程例11-2 使用JProgressBarprivate JProgressBar progressBar = new JProgressBar();private JButton startButton = new JButton(sta
4、rtcontentPane.add(startButton);contentPane.add(progressBar);progressBar.setStringPainted(true);startButton.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) (new UpdateThread().start(););class UpdateThread extends Thread Runnable update, finish;int value, min, max, in
5、crement;public UpdateThread() max = progressBar.getMaximum();min = progressBar.getMinimum();update = new Runnable() public void run() value = progressBar.getValue() + increment;updateProgressBar(value);finish = new Runnable() updateProgressBar(min);startButton.setEnabled(false);while(value + increme
6、nt = max) simulateTimeConsumingActivity();SwingUtilities.invokeLater(update);SwingUtilities.invokeLater(finish);startButton.setEnabled(true);private void updateProgressBar(int value) progressBar.setValue(value);private void simulateTimeConsumingActivity() try Thread.currentThread().sleep(1000);incre
7、ment = (max - min) / 10;catch(InterruptedException e) e.printStackTrace();11.1.2 JProgressBar属性11.1.3 JProgressBar事件例11-3 监视一个进度条的值import javax.swing.event.*;private JProgressBar pb = new JProgressBar();final JButton startButton = new JButton(new GetInfoThread(pb).start();pb.addChangeListener(new Ch
8、angeListener() public void stateChanged(ChangeEvent e) int min = pb.getMinimum(), max = pb.getMaximum();int value = pb.getValue();showStatus(Min: + min + , Max: + max +, Value: + value);class GetInfoThread extends Thread JProgressBar pb;public GetInfoThread(JProgressBar progressBar) pb = progressBar
9、;max = pb.getMaximum();min = pb.getMinimum();value = pb.getValue() + increment;pb.setValue(value);value = min;11.1.4 JProgressBar类总结11.1.5 AWT兼容11.2 JSlider例11-4 一个简单的JSlider例子import java.util.*;JSlider slider = new JSlider();contentPane.add(slider, BorderLayout.NORTH);11.2.1 填充的滑杆例11-5 一个填充的滑杆publi
10、c Test() slider.putClientProperty(JSlider.isFilled,Boolean.TRUE);11.2.2 滑杆间隔标记例11-6 显示滑杆的间隔标记JPanel controlPanel = new ControlPanel(slider);contentPane.setLayout(new BorderLayout(0,40);contentPane.add(controlPanel, BorderLayout.NORTH);contentPane.add(slider, BorderLayout.CENTER);class ControlPanel e
11、xtends JPanel public ControlPanel(final JSlider slider) JCheckBox paintTicks = new JCheckBox(Paint TicksJComboBox minorSpacing = new JComboBox(),majorSpacing = new JComboBox();minorSpacing.addItem(0351020majorSpacing.addItem(add(paintTicks);add(new JLabel(Minor Tick Spacing:);add(minorSpacing);Major
12、 Tick Spacing:add(majorSpacing);paintTicks.addActionListener(new ActionListener() JCheckBox cb = (JCheckBox)e.getSource();slider.setPaintTicks(cb.isSelected();slider.repaint();minorSpacing.addItemListener(new ItemListener() public void itemStateChanged(ItemEvent e) JComboBox cb = (JComboBox)e.getSou
13、rce();int spacing = Integer.parseInt(String)cb.getSelectedItem();slider.setMinorTickSpacing(spacing);slider.revalidate();majorSpacing.addItemListener(new ItemListener() slider.setMajorTickSpacing(spacing);11.2.3 滑杆标签例11-7 显示缺省的JSlider标签slider.setPaintLabels(true);slider.setMajorTickSpacing(20);例11-8
14、 定制滑杆标签Icon icons = new ImageIcon(basketball.gif), baseball.gifsoccer.gifclipboard.giffilmstrip.gifcrab.gifHashtable table = new Hashtable();for(int i=0, loc=0; icons.length; i+, loc += 20) table.put(new Integer(loc), new JLabel(Integer.toString(loc), iconsi,JLabel.LEFT);slider.setLabelTable(table);
15、11.2.4 反转滑杆值例11-9 中列出图11-10中示出的小应用程序的代码private JCheckBox checkBox = new JCheckBox(Invertprivate JSlider sliders = new JSlider(), new JSlider(JSlider.VERTICAL) ;contentPane.add(checkBox); sliders.length;slidersi.setPaintLabels(true);slidersi.setMajorTickSpacing(20);contentPane.add(slidersi);checkBox.addActionListener(new ActionListener() +i)slidersi.setInverted(checkBox.isSelected();11.2.5 滑杆的外延值例11-10 设置一个滑杆的外延值contentPane.add(slider, BorderLayout.SOUTH);slider.addChangeListener(new ChangeListener() JSlider s = (JSlider)e.getSource(); + s.getMinimum() + + s.get
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