小例子,100%JAVA,有ALT+KEY

package downtimemodule;import javax.swing.*;import java.awt.*;import java.awt.event.*;public class SwingApplication {    private static String labelPrefix = "Number of button clicks: ";    private int numClicks = 0; //计数器，计算点击次数    public Component createComponents() {        final JLabel label = new JLabel(labelPrefix + "0 ");        JButton button = new JButton("I'm a Swing button!");        button.setMnemonic(KeyEvent.VK_I); //设置按钮的热键为'I',这样设置有下划线,ALT+键        button.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                numClicks++;                label.setText(labelPrefix + numClicks);            }        });        label.setLabelFor(button);        JPanel pane = new JPanel();        pane.setBorder(BorderFactory.createEmptyBorder(                30, //top                30, //left                10, //bottom                30) //right                );        pane.setLayout(new GridLayout(0, 1)); //单列多行        pane.add(button);        pane.add(label);        return pane;    }    public static void main(String[] args) {        try {            UIManager.setLookAndFeel(                    UIManager.getCrossPlatformLookAndFeelClassName());        } catch (Exception e) {        }        JFrame frame = new JFrame("SwingApplication");        SwingApplication app = new SwingApplication();        Component contents = app.createComponents();        frame.getContentPane().add(contents, BorderLayout.CENTER);//窗口设置结束，开始显示        frame.addWindowListener(new WindowAdapter() {//匿名类用于注册监听器            @Override            public void windowClosing(WindowEvent e) {                System.exit(0);            }        });        frame.pack();        frame.setVisible(true);    }}