Java set focus on JButton when pressing enter

How can I make it so tha开发者_JAVA百科t when I press enter in a JTextField it activates a specific JButton? What I mean is something along the lines of a web page form where you can press enter to activate the button in the form.

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You should use an Action for the JButton:

Action sendAction = new AbstractAction("Send") {
    public void actionPerformed(ActionEvent e) {
         // do something
    }
};

JButton  button = new JButton(sendAction);

Then you can set the same action for a JTextField or even on a MenuItem if you want the same action to be available in the Menu:

JTextField textField = new JTextField();
textField.setAction(sendAction);

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Something like this should work:

textField.addActionListener(new ActionListener()
{
    @Override
    public void actionPerformed(ActionEvent e)
    {
        button.requestFocusInWindow();
    }
});

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You can achieve this by adding the default behavior to the button, like this

cmdLogin.setDefaultCapable(true); // by default, this is true
this.getRootPane().setDefaultButton(cmdLogin); // here `this` is your parent container

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I'd do something like the following:

textField.addKeyListener(
  new KeyAdapter() {
     public void keyPressed(KeyEvent e) {
       if (e.getKeyCode() == KeyEvent.VK_ENTER) {
          button.doClick();
       }
     }
  });
}