Passing objects into a class constructor

I've created a frame for inputting a patient's medical results. There are lots of buttons for temperature, blood pressure, etc. I've created a separate, inner class that creates a NumberPad frame to enter the patient's results. Press the "Temp." button, for example, a NumberPad appears, you enter the temperature, press the "Enter" button on the NumberPad and the number appears in a Label next to the "Temp." button.
The problem is that I've written the constructor of the NumberPad with a label parameter so that the right label gets updated. e.g.
class NumberPad extends Frame implements ActionListener
public NumberPad(Label aLabel)
However, because I've implemented ActionListener, I've had to override the actionPerformed method and I don't know how to pass the aLabel object that I give to the NumberPad constructor into the actionPerformed method so that, for example
public actionPerformed(ActionEvent evt)
String s = evt.getActionCommand
if (s.equals("ENTER")
aLabel.setText(display of numberpad);
How do I transfer the aLabel object into the actionPerformed method so that the correct label gets updated?

Store the label as an instance variable.
class NumberPad extends Frame implements ActionListener {
    private Label aLabel;
    public NumberPad(Label aLabel) {
        this.aLabel = aLabel;
    public actionPerformed(ActionEvent evt) {
        String s = evt.getActionCommand;
        if (s.equals("ENTER") {
            aLabel.setText(display of numberpad);
}[/code}

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Edited by: TD_ROC on May 6, 2008 12:03 PM

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ok,
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Did you bother to do a search?
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Thanks for your reply.
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hi check out
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I worked on BEA rules engine 4 months back. I'm sure you can pass any JAVA object to it's working meomory. I am giving my sample rules here, hope it will be helpful for you.
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Hi,
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flagCheckout = IsProjectCheckedOut(myProjectId);
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Regards,
Sabitha

Standard Information:PSI Entry Point:
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Hi.
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No Pass-by-Value or Copy Constructors

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Nitin_Mathur wrote:
at one time i had doubted my own conceptsNote that the type of a parameter may be different from the type of the object you created. However, it is still the same value that is passed, as pointed out by this example:
public class Test {
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interface MyInterface {
    public void testInterface();
class MyClass implements MyInterface {
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