JScrollPane not working in null layout

Question

  import javax.swing.JCheckBox;
  import javax.swing.JFrame;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.JScrollPane;

public class Sc         


        

Answer 1

You should create your own panel that extends JPanel containing all checkboxes and in this panel override getPreferredSize() method like:

@Override
public Dimension getPreferredSize()
{
    return new Dimension( 300,300 );
}

and use it in your code:

...

// creating the scroll pane that will scroll the panel.
JScrollPane jscrlPane = new JScrollPane( new MyPanelWithCheckboxes() );
jscrlPane.setBounds( 0, 0, 300, 300 );
...