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Java Forum / GUI / December 2003

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Multiple JButton ActionListeners

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kelvSYC - 03 Dec 2003 04:59 GMT
Say I had two class a and b defined like so

class a implements ActionListener {
  private final b foo = new b();
 
  a() {
     b.getButton().addActionListener(this);
  }
 
  public void actionPerformed(ActionEvent e) {
     // More Code Here
  }
}

class b implements ActionListener {
  private final JButton   button = new JButton("Click Me");
 
  b() {
     button.addActionListener(this);
  }

  public JButton getButton() {
     return button;
  }
 
  public void actionPerformed(ActionEvent e) {
     // Code here
  }
}

Normally, if the "Click Me" button is pressed, A's actionPerformed
would be executed before B's.  Is there a way so that the opposite
occurs.  Is there a way to reverse this?

Signature

I am only a mirage.

xarax - 03 Dec 2003 13:29 GMT
> Say I had two class a and b defined like so

/snip uncompilable broken Java code/

> Normally, if the "Click Me" button is pressed, A's actionPerformed
> would be executed before B's.  Is there a way so that the opposite
> occurs.  Is there a way to reverse this?

No. The order in which listeners are called in unspecified
and your code cannot depend upon any particular implementation
calling order. The order can change when you move to another
platform, or by simply upgrading to the next release. Your
code is Broke As Designed (b.a.d.).


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