Question

HY!

I want to create a TabbedPane with a jTable.

Designer:

Constructor Code in JForm:

    initComponents();
    this.add(jTabbedPane1);
    jTabbedPane1.addTab("Test", jPanel1);
    jPanel1.add(jTable1);

Auto-Gen-Code:

private void initComponents() {

        jTabbedPane1 = new javax.swing.JTabbedPane();
        jPanel1 = new javax.swing.JPanel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
        jButton_add = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jPanel1.setMinimumSize(new java.awt.Dimension(550, 300));

        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {"dddsds", null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            },
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
            }
        ));
        jScrollPane1.setViewportView(jTable1);

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 530, Short.MAX_VALUE)
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 287, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(27, Short.MAX_VALUE))
        );

        jButton_add.setText("add");
        jButton_add.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
        jButton_add.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton_addActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                        .addGap(39, 39, 39)
                        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jTabbedPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 579, Short.MAX_VALUE))
                    .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                        .addGap(31, 31, 31)
                        .addComponent(jButton_add)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jTabbedPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 22, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(28, 28, 28)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(jButton_add)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>

Problem:

the jTable1 is invisible and the button is under the jTabbedPane and not under the jPanel.

Please help

Answer 1

You should not add jTable1 twice to jPanel1. initComponents() already adds jScrollPane1 (which includes jTable1) to jPanel1 through the use of jPanel1Layout. But in your constructor, you add jTable1 a second time, explicitly to jPanel1. Hence your constructor should just be as follows:

initComponents();
this.add(jTabbedPane1);
jTabbedPane1.addTab("Test", jPanel1);

Note tha I’ve removed the line jPanel1.add(jTable1);

Then you have the same problem with jTabbedPane1, which is added twice to the content pane.

From the generated code I see, I would say you have probbably made some bad manipulation of Netbeans GUI designer, because jTable1 is NOT inside jTabbedPane1 but directly inside the content pane of the frame. I guess you should redesign your panel from scratch or at least modify your UI in the designer.

The important point to understand is that, when you use GroupLayout API, components are automatically added to their container and hence shouldn’t be added explcitily.

My best advice, actually, would be: don’t use NetBeands UI designer and code your UI by hand (but not with GroupLayout which is too complex to be coded manually).