Java tutorial
import java.awt.AWTEventMulticaster; import java.awt.BorderLayout; import java.awt.Color; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; public class Main { public static void main(String args[]) { JFrame frame = new JFrame("Key Text Sample"); KeyTextComponent keyTextComponent = new KeyTextComponent(); final JTextField textField = new JTextField(); ActionListener actionListener = new ActionListener() { public void actionPerformed(ActionEvent actionEvent) { String keyText = actionEvent.getActionCommand(); textField.setText(keyText); } }; keyTextComponent.addActionListener(actionListener); frame.add(keyTextComponent, BorderLayout.CENTER); frame.add(textField, BorderLayout.SOUTH); frame.setSize(300, 200); frame.setVisible(true); } } class KeyTextComponent extends JPanel { private ActionListener actionListenerList = null; public KeyTextComponent() { setBackground(Color.cyan); KeyListener internalKeyListener = new KeyAdapter() { public void keyPressed(KeyEvent keyEvent) { if (actionListenerList != null) { int keyCode = keyEvent.getKeyCode(); String keyText = KeyEvent.getKeyText(keyCode); ActionEvent actionEvent = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, keyText); actionListenerList.actionPerformed(actionEvent); } } }; MouseListener internalMouseListener = new MouseAdapter() { public void mousePressed(MouseEvent mouseEvent) { requestFocus(); } }; addKeyListener(internalKeyListener); addMouseListener(internalMouseListener); } public void addActionListener(ActionListener actionListener) { actionListenerList = AWTEventMulticaster.add(actionListenerList, actionListener); } public void removeActionListener(ActionListener actionListener) { actionListenerList = AWTEventMulticaster.remove(actionListenerList, actionListener); } }