Question

I hava jframe1 and jframe2 which extends javax.swing.JFrame in netbeans.(in the same project).

jframe2 has a jpanel1. What is the wise way to share data between two forms ?

Answer 1

I guess NetBeans created a panel named jPanel1 inside your Jframe2. The reason why you are getting an error is because NetBeans defaulted jPanel1 accessibility to private and is not visible from the outside world. You should change its accessibility to public if you want to do that.

A more elegant way: you could add a method to JFrame2 to take care of adding a button to its visual appearance. Something along these lines:

public class JFrame2 extends JFrame{
  //... 
  public void addButtong(JButton button){
     jPanel1.add(bt);
  }
}

and use it like this:

JButton bt = new javax.swing.JButton();
bt.setText("from jframe1 button1");
Jframe2.addButtong(bt);