can not add panel to scrollPane, application has no change

Question

I add panel4 to scrollPane, but my application wasn't change. This is my code:

   public class Bill extends JPanel {
      //some Jlabels, JComboBox......
      public Bill(){

      JPanel panel1 = new JPanel();
      panel1.setLayout(new GridLayout(7,1,10,20));
      //add some labels to panel

      JPanel panel2 = new JPanel();
      panel2.setLayout(new GridLayout(7,4,10,10 ));

        //add some components to panel

      JPanel panel3=new JPanel(new GridLayout(4,1,10,10));
      panel3.add(CRTA);
      panel3.add(UKUPNO);
      panel3.add(jbtView);
      panel3.add(jbtCancel);

and finally panel4

     JPanel panel4=new JPanel();
     panel4.add(panel1, BorderLayout.WEST);
     panel4.add(panel2, BorderLayout.CENTER);

     JScrollPane scrollPane = new JScrollPane();
     scrollPane.getViewport().add( panel4 );  
     add(scrollPane,BorderLayout.CENTER);
     add(panel3, BorderLayout.SOUTH);

---

this is what I got

inside rectange is panel4( panel with numbers and comboboxes )

and this is when I change size

No scroll shows

Answer 1

Basically, you should add everything on panel4 (including panel3) and then add panel4 on JScrollPane. After that, add that JScrollPane on CENTER of JTabbedPane.

Also never call setXXXSize methods on your JButton's.

EDIT

I played a bit with your idea:

I hope this will help you about look of your UI. And again: Don't call setXXXSize methods, let some other things to determine size of your component, like size of font in case of that JTextField right to "Total" JLabel or size of icons in these JButton's in "Hot drinks" panel.