VK code for Enter

Question

when i try the code
Robot r = new Robot();
r.keyPress(20);
r.keyRelease(20);
it works for all the VK values i found except for 20 for return, i jus get Invalid key code Eception. can any one tell me the integer code for enter?
thanks

Answer 1

i tried that but it doesn't seem to work. ...Here is a little example I made.
Does it work as you expect?import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/** Example of using the Robot to type in a text field,
use the enter key, and activate a button via the space bar. */
class ActivateButtonUsingRobot {
   static Robot robot;
   static void activateKey(int keycode) {
      robot.keyPress( keycode );
      robot.keyRelease( keycode );
      robot.delay( 150 );
   public static void main(String[] args)
      throws AWTException {
      // if headless, exit early
      robot = new Robot();
      final JFrame f = new JFrame();
      f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
      JTextArea ta = new JTextArea("1st line!",10,20);
      f.getContentPane().add(ta, BorderLayout.CENTER);
      JButton button = new JButton("Press Me!");
      button.addActionListener( new ActionListener() {
         public void actionPerformed( ActionEvent ae ) {
            JOptionPane.showMessageDialog(
               f, "Button Activated!" );
      f.getContentPane().add(button, BorderLayout.SOUTH);
      f.pack();
      // put frame in center of screen
      f.setLocationRelativeTo(null);
      f.setVisible(true);
      Dimension screensize =
         Toolkit.getDefaultToolkit().getScreenSize();
      // move mouse to center of screen, and ..
      robot.mouseMove(
         screensize.width/2, screensize.height/2 );
      // ..activate the frame
      robot.mousePress( InputEvent.BUTTON1_MASK );
      robot.mouseRelease( InputEvent.BUTTON1_MASK );
      robot.delay( 400 );
      // try using enter key..
      activateKey( KeyEvent.VK_ENTER );
      activateKey( KeyEvent.VK_ENTER );
      // this text should have a blank line above it..
      activateKey( KeyEvent.VK_H );
      activateKey( KeyEvent.VK_I );
      // move to the button
      robot.keyPress( KeyEvent.VK_CONTROL );
      robot.keyPress( KeyEvent.VK_TAB );
      robot.keyRelease( KeyEvent.VK_TAB );
      robot.keyRelease( KeyEvent.VK_CONTROL );
      robot.delay( 500 );
      // try activating the button..
      activateKey( KeyEvent.VK_SPACE );
}