About java.awt.Robot

[Ailsa Cape]

Hi, everyone.

I find a strange case when I use the class Robot.

class MyFrame extends JFrame{
    ...
    MyFrame(){
        ...
        JButton book = new JButton("Book");
        book.setMnemonic(KeyEvent.VK_B); 
        JTextField ownerText = new JTextField();
 
        ownerText.addaddKeyListener(new KeyAdapter(){       
            public void keyPressed(KeyEvent e){
                String temp = ownerText.getText();  
                if(temp.length()>0 && e.getKeyCode()==KeyEvent.VK_ENTER){
                    try{
                        Robot robot = new Robot();
                        [B]robot.keyPress(KeyEvent.VK_B);[/B]
                        [B]robot.keyRelease(KeyEvent.VK_B);[/B]
                    }catch(AWTException awt){
                        awt.printStackTrace();
                    }    
                }           
            }                
        });
    }
}

It doesn't press the book button when I enter "1245" in the ownerText and then press Enter key.

Any advice will be appreciated!
Ailsa Cape

[Michael Dunn]

does your button fire if you press B?

or does it fire when you press ALT-B?

[Ailsa Cape]

Hi,Michael

Thank you for your reply.
Yes, when I press ALT-B, the book button fires as expected. I think the bold code above is to mimic the action of pressing ALT-B in the keyboard, but it doesn't work this way. After I enter something in the ownerText and press the Enter key, nothing happens. Could you give me some idea of it?

Thanks in advance!
Ailsa Cape

[Michael Dunn]

> Yes, when I press ALT-B, the book button fires as expected.

your robot only presses B

[Ailsa Cape]

Hi, Michael

How to make the robot presses ALT-B instead of B?

Thanks in advance!
Ailsa Cape

[Michael Dunn]

experiment a little

you have
robot.keyPress(KeyEvent.VK_B);
robot.keyRelease(KeyEvent.VK_B);

what about trying
robot.keyPress(KeyEvent.VK_ALT);
robot.keyPress(KeyEvent.VK_B);
robot.keyRelease(KeyEvent.VK_B);
robot.keyRelease(KeyEvent.VK_ALT);

[Ailsa Cape]

Hi, Michael

Thank you! It works. The book button's shortcut key is B in the keyboard when I use "book.setMnemonic(KeyEvent.VK_B)". I don't know why I should have to press ALT-B to fire the button?

Thanks in advance!
Ailsa Cape