这是有关如何实现弹出式键盘的简单示例：
import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Font;import java.awt.GridLayout;import java.awt.Point;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import javax.swing.JButton;import javax.swing.JDialog;import javax.swing.Jframe;import javax.swing.JTextField;import javax.swing.SwingUtilities;@SuppressWarnings("serial")public class Mainframe extends Jframe{ private JTextField txt; private PopUpKeyboard keyboard; public Mainframe() { super("pop-up keyboard"); setDefaultCloseOperation(EXIT_ON_CLOSE); txt = new JTextField(20); keyboard = new PopUpKeyboard(txt); txt.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { Point p = txt.getLocationOnScreen(); p.y += 30; keyboard.setLocation(p); keyboard.setVisible(true); } }); setLayout(new FlowLayout()); add(txt); pack(); setLocationByPlatform(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { new Mainframe().setVisible(true); } }); } private class PopUpKeyboard extends JDialog implements ActionListener { private JTextField txt; public PopUpKeyboard(JTextField txt) { this.txt = txt; setLayout(new GridLayout(3, 3)); for(int i = 1; i <= 9; i++) createButton(Integer.toString(i)); pack(); } private void createButton(String label) { JButton btn = new JButton(label); btn.addActionListener(this); btn.setFocusPainted(false); btn.setPreferredSize(new Dimension(100, 100)); Font font = btn.getFont(); float size = font.getSize() + 15.0f; btn.setFont(font.deriveFont(size)); add(btn); } @Override public void actionPerformed(ActionEvent e) { String actionCommand = e.getActionCommand(); txt.setText(txt.getText() + actionCommand); } }}
