Map actions with keystrokes : Action « Swing Event « Java Tutorial

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.util.Hashtable;

import javax.swing.Action;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.text.DefaultEditorKit;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.Keymap;
import javax.swing.text.TextAction;
import javax.swing.text.Utilities;

public class Main {
  public static void main(String[] args) {
    JTextArea area = new JTextArea(6, 32);
    Keymap parent = area.getKeymap();
    Keymap newmap = JTextComponent.addKeymap("KeymapExampleMap", parent);

    KeyStroke u = KeyStroke.getKeyStroke(KeyEvent.VK_U, InputEvent.CTRL_MASK);
    Action actionU = new UppercaseAction();
    newmap.addActionForKeyStroke(u, actionU);

    Action actionList[] = area.getActions();
    Hashtable lookup = new Hashtable();
    for (int j = 0; j < actionList.length; j += 1)
      lookup.put(actionList[j].getValue(Action.NAME), actionList[j]);

    KeyStroke L = KeyStroke.getKeyStroke(KeyEvent.VK_L, InputEvent.CTRL_MASK);
    Action actionL = (Action) lookup.get(DefaultEditorKit.selectLineAction);
    newmap.addActionForKeyStroke(L, actionL);


    JFrame f = new JFrame();
    f.add(new JScrollPane(area), BorderLayout.CENTER);
    area.setText("this is a test");


class UppercaseAction extends TextAction {
  public UppercaseAction() {

  public void actionPerformed(ActionEvent e) {
    JTextComponent comp = getTextComponent(e);
    if (comp == null)
    Document doc = comp.getDocument();
    int start = comp.getSelectionStart();
    int end = comp.getSelectionEnd();
    try {
      int left = Utilities.getWordStart(comp, start);
      int right = Utilities.getWordEnd(comp, end);
      String word = doc.getText(left, right - left);
      doc.remove(left, right - left);
      doc.insertString(left, word.toUpperCase(), null);
    } catch (Exception ble) {

15.3.1.AbstractAction Lookup Property Keys
15.3.2.Creating an Action
15.3.3.Action Usage ExampleAction Usage Example
15.3.4.extends AbstractActionextends AbstractAction
15.3.5.Disable an ActionDisable an Action
15.3.6.Get and set Action Command
15.3.7.Register action
15.3.8.ActionMap javax.swing.JComponent.getActionMap()
15.3.9.Map actions with keystrokes
15.3.10.Enabling an Action
15.3.11.Listing the Actions in a Component