Question

Hi I am trying to add an object for example a JLabel from a main class to a secondary class that inherits the attributes of a JPanel.I have created a basic example that shows what I was trying to do but it dosen’t work.Here is my code:

public class main extends JFrame{


public main(){
    this.setVisible(true);
    this.setSize(600, 600);
    panel nou = new panel(new JLabel("a mers"));
}
public static void main (String[] args){
    new main();
}

}

public class panel extends JPanel{

    public panel(JLabel nou){
        this.add(nou);
    }
}

My original code has to add some images from an external class and I tried the same aproach but it dosen’t work.How can I achive this?

EDIT:This is just an example I need to add this component from an external class

Answer 1

Use Container#add(Component). You can use it the same way within the constructor as you can outside of it (without the this).

nou.add(new JLabel("trees"));