swing透明窗体

public class TranslucentWindow extends JFrame {
public TranslucentWindow() {
super("透明窗体");
this.setLayout(new FlowLayout());
this.add(new JButton("按钮"));
this.add(new JCheckBox("复选按钮"));
this.add(new JRadioButton("单选按钮"));
this.add(new JProgressBar(20, 100));
this.setSize(new Dimension(400, 300));
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public static void main(String[] args) {
JFrame.setDefaultLookAndFeelDecorated(true);
SwingUtilities.invokeLater(new Runnable() {
public void run() {
Window w = new TranslucentWindow();
w.setVisible(true);
com.sun.awt.AWTUtilities.setWindowOpacity(w, 0.6f);
}
});
}
}