Controlling JComponents from other classes

Question

Is it possible to control instances like variables, jcomponents, timer in other external classes?

For example this is my Class1

public class Class1 extends JFrame {
    JLabel lbl = new JLabel("Hello");
    public Class1() {
        super("Class1");
        Container c = getContentPane();
        setLayout(null);
        c.add(lbl);
        lbl.setBounds(0,0,100,20);
        Class2.process();
        setSize(200,100);
        setLocationRelativeTo(null);
        setVisible(true);
    }
    public static void main(String var[]) {
        new Class1();
    }
}

You can see there's Class2.process(); Here's the other class externally but in the same folder

public class Class2 {
    public static void process() {
        // I want to control lbl from Class1 class inside this method like
        // lbl.setVisible(false);
    }
    public static void main(String args[]) {
        //
    }
}

Is it possible? Sorry. I can't find answers on other website.

Answer 1

You have to pass the instance of JLabel e.g.;

JLabel lbl = new JLabel("Hello"););
Class2.process(lbl);


public class Class2 {
    public static void process(JLabel lbl) {
        // I want to control lbl from Class1 class inside this method like
        lbl.setVisible(false); // this will change your Class1 Jlabel
    }