先睹為快，看效果：import java.awt.Color;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.SwingUtilities;import javax.swing.UIManager;import com.sun.awt.AWTUtilities;public class MainFrame extends JFrame {private JButton button;private JPanel panel;public MainFrame() {panel = new JPanel();panel.setBounds(0, 0, this.getWidth(), this.getHeight());panel.setBackground(Color.RED);button = new JButton("Click Me！");button.setBounds(50, 50, 100, 25);this.setSize(800, 600);this.setLocation(0, 0);this.setLayout(null);this.add(panel);this.add(button);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setVisible(true);button.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {JOptionPane.showMessageDialog(null,"My name is 'XXX', Nice to meet you!");}});}public static void main(String[] args) {SwingUtilities.invokeLater(new Runnable() {public void run() {try {JFrame.setDefaultLookAndFeelDecorated(true);UIManager.setLookAndFeel("ch.randelshofer.quaqua.QuaquaLookAndFeel");} catch (Exception e) {e.printStackTrace();}JFrame w = new MainFrame();w.setBackground(Color.BLACK);AWTUtilities.setWindowOpacity(w, 0.5f);}});}}關鍵區段：main方法裡面：public static void main(String[] args) {SwingUtilities.invokeLater(new Runnable() {public void run() {try {JFrame.setDefaultLookAndFeelDecorated(true);UIManager.setLookAndFeel("ch.randelshofer.quaqua.QuaquaLookAndFeel");} catch (Exception e) {e.printStackTrace();}JFrame w = new MainFrame();w.setBackground(Color.BLACK);AWTUtilities.setWindowOpacity(w, 0.5f);}});
}注意：UIManager.setLookAndFeel("ch.randelshofer.quaqua.QuaquaLookAndFeel");之前一定要加上JFrame.setDefaultLookAndFeelDecorated(true);
所用到的第三方包：quaqua.jar
