Java Swing KeyStroke create from key event

Description

Java Swing KeyStroke create from key event 

import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.KeyStroke;

public class Main {
   public static void main(String[] a) {
      String ACTION_KEY = "theAction";
      JFrame frame = new JFrame("KeyStroke Sample");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      JButton buttonA = new JButton("<html><center>FOCUS/RELEASE<br>VK_ENTER");
      Action actionListener = new AbstractAction() {
         public void actionPerformed(ActionEvent actionEvent) {
            JButton source = (JButton) actionEvent.getSource();
            System.out.println(source.getText());
         }/*w ww. j a  v  a 2  s  .  co  m*/
      };
      KeyStroke enter = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true);
      InputMap inputMap = buttonA.getInputMap();
      inputMap.put(enter, ACTION_KEY);
      ActionMap actionMap = buttonA.getActionMap();
      actionMap.put(ACTION_KEY, actionListener);
      buttonA.setActionMap(actionMap);
      frame.add(buttonA);
      frame.setSize(400, 200);
      frame.setVisible(true);
   }
}



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