Re: What's wrong with JList in JScrollPanel

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sun, 21 Sep 2008 18:55:54 -0700
Message-ID:
<48d6fb28$0$28818$b9f67a60@news.newsdemon.com>
fancyerii wrote:

  I want to design a Frame which cotains 2 buttons. When I click
button1, the frame display a JPanel(Panel1) and when I click

 button2, it displays another JPanel(Panel2).

  codes in Frame1:
        jButton1.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                if (selected != null)
                    Frame1.this.remove(selected);
                selected = new Panel1();

                selected.setBounds(0, 0, 400, 300);
                Frame1.this.add(selected);
                Frame1.this.repaint();

            }
        });

There is a JLabel and a JScorllPane which contains a JList in Panel1
There is a JList and a JScorllPane which contains a JList in Panel1
In Panel1, JLabel can display correctly. But JScrollPanel display
nothing.
In Panel2, JList can display correctly. But JScrollPanel display
nothing.

What's wrong with JList in JScrollPane?

Panel1 and Panel2:

public class Panel1 extends JPanel {
    public Panel1() {
        try {
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    private void jbInit() throws Exception {
        this.setLayout(null);
        DefaultListModel model=new DefaultListModel();
        model.addElement("1");
        model.addElement("2");
        jList1.setModel(model);
        jScrollPane1.setBounds(new Rectangle(59, 62, 285, 131));
        jLabel1.setText("jLabel1");
        jLabel1.setBounds(new Rectangle(62, 25, 151, 23));
        this.add(jScrollPane1);
        this.add(jLabel1);
        jScrollPane1.getViewport().add(jList1);
    }

    JScrollPane jScrollPane1 = new JScrollPane();
    JList jList1 = new JList();
    JLabel jLabel1 = new JLabel();
}

public class Panel2 extends JPanel {
    public Panel2() {
        try {
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    private void jbInit() throws Exception {
        this.setLayout(null);
        DefaultListModel model=new DefaultListModel();
        model.addElement("1");
        model.addElement("2");
        jList1.setModel(model);
        jList2.setModel(model);
        jScrollPane1.setBounds(new Rectangle(86, 61, 236, 161));
        jList2.setBounds(new Rectangle(73, 11, 65, 29));
        this.add(jScrollPane1);
        this.add(jList2);
        jScrollPane1.getViewport().add(jList1);
    }

    JScrollPane jScrollPane1 = new JScrollPane();
    JList jList1 = new JList();
    JList jList2 = new JList();
}


Your code doesn't make any sense. I can only suggest that you use a
layout manager and forget the setBounds() method. Every Java
installation uses different fonts and different screen resolutions. A
layout manager will allow your code to work not only on your machine but
on everybody else's too.

Please give us a little better description and we could probably give
you some simple code to layout your design without much difficulty.

--

Knute Johnson
email s/nospam/knute2008/

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