Initialize variable with constructor

Question

I have two class, first is my main class, and second class in my edit frame class.

public class RecordTableGUI extends JFrame implements ActionListener {
            


        

Answer 1

Java objects are somewhatlike real objects. And new does what its name suggests: it creates a new object. Let's take a simple example:

Box box1 = new Box();
Box box2 = new Box();
box1.fillWithCandies(candies);

box1 is a box filled with candies. box2 is a different box, which doesn't contain anything, because only box1 has been filled with candies.

In your code, updateGUI's actionPerformed() method creates a new RecordTableGUI object, with the new name. That won't change anything to the first one.

If you want updateGUI to modify the existing RecordTableGUI object, it needs to have a reference to this object:

public class updateGUI extends JFrame implements ActionListener {

    private RecordTableGUI recordTableGUIToUpdateWhenOKIsClicked;

    public updateGUI(RecordTableGUI recordTableGUIToUpdateWhenOKIsClicked, ...) {
        this.recordTableGUIToUpdateWhenOKIsClicked = 
            recordTableGUIToUpdateWhenOKIsClicked;
        ...
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == okButton) {
            newName = tf.getText();
            this.recordTableGUIToUpdateWhenOKIsClicked.setNewName(newName);
        }
    }
}

You should practice with simpler examples before using Swing. You should also respect the Java naming conventions. And the updateGui class should be a JDialog, not a JFrame.