"add" method

[Candy Bortniker]

I have a program that is suppose to allow the user to press enter to move to the next textfield. My instructor says I need a "add" method that will put a listener into the vector. My problem is that I don't know really how to write this statement. There is a lot of code to this and I'm not sure how much you need to see to give me any help.
This is in LimitedTextContainer:

  
myText.addActionListener( new ActionListener(){
public void actionPerformed (ActionEvent evt){
  if (minimum <= value && value  <= maximum)
  {
    LimitedTextEvent lte = new LimitedTextEvent LimitedTextContainer.this);
    Vector listCopy;
    LimitedTextListener ltl;
    synchronized (listeners)
    {
listCopy = (Vector)listeners.clone();
System.out.println("listeners = " + listeners);
    }
    for(int i = 0; i < listCopy.size(); i++)
    {
System.out.println("I'm getting here.");
ltl = (LimitedTextListener)(listCopy.elementAt(i));
ltl.enterPressed(lte);
    }
  }//end if exact match on size
}
});

Here is the driver program:

public class LimitedTextTest extends JFrame
{
    // attributes:
    LimitedTextContainer lt1;
    JTextField   tf1;
    public LimitedTextTest ()
    {
        Container contentPane = getContentPane();
        contentPane.setLayout ( null );
        JLabel lblName = new JLabel ( "SSN(9 chars) :" );
        contentPane.add ( lblName );
        lblName.setBounds ( 30, 30, 150, 20 );
        lt1 = new LimitedTextContainer ( "123456789" );
        contentPane.add ( lt1 );
        lt1.setBounds ( 180, 30, 150, 20 ); 
        JLabel lblAddress = new JLabel ( "Group Number: " );
        contentPane.add ( lblAddress);
        lblAddress.setBounds ( 30, 60, 150, 20 );
        tf1 = new JTextField ( 15 );
        tf1.setBounds ( 180, 60, 150, 20 );
        contentPane.add ( tf1 );
        setTitle ( "Limited Text Tester" );
        setSize ( 400, 200 );
        add
        addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent evt)
            {
                System.exit(0);
            }
        });
        show();
    }
    public static void main ( String [] args )
    {
        new LimitedTextTest ();
    }
};
  

[Gregg Bolinger]

If I understand what you are saying you will need something like...

private void addListenerToVector(Vector v, ListenerClass l)
{
   v.add(l);
}

Then calling this somewhere in your code would be

addListenerToVector(listCopy, myListener);

Without knowing what Listener needs added and to what Vector I took a guess at the Vector and made up a Listener name. I think the point your instructor is trying to make is code re-use. So instead of issuing the Vector's add() method whenever you need it, you would just call a single function that would do the same thing. However, this seems like calling an extra method because a Vector already has an add() method. So it kind of me.
[ March 01, 2004: Message edited by: Gregg Bolinger ]