import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

class Example3
  extends JFrame
{
  public Example3()
  {
    Container content_pane = this.getContentPane();
    content_pane.setLayout(new FlowLayout());

    JButton button = new JButton("Hello world");
    JCheckBox checkbox = new JCheckBox("Hello world");
    
    content_pane.add(button);
    content_pane.add(checkbox);

    //// sharing a common model across 2 views
    checkbox.setModel(button.getModel());
    
    setSize(300,300);
    setVisible(true);
  }
  
  public static void main(String argv[])
  {
    new Example3();
  }
}