Changing text on a JLabel from another class

Question

So, I have been trying to figure this out for a little bit and cannot figure out how to do it. I want one of my buttons in another class to change the text of a JLabel in th

Answer 1

First, add a getter with public access so your second class can access the field. Something like,

public JLabel getError() {
     return error;
}

Or (as @MadProgrammer suggested in the comments, a mutator) like

public void setError(String txt) {
     error.setText(txt);
}

Then modify your second class, and pass the instance of GUI to it in the constructor. Like,

public class guessHandler implements ActionListener{
    private GUI gui;
    public guessHandler(GUI gui) {
        this.gui = gui;
    }
    public void actionPerformed(ActionEvent e) {
        gui.changePOS(4, 50, 0, 300, 20);
        gui.setError("HI from guessHandler.java");
    }
}