Java - JComboBox in a JTable cell

MainJFrame.java

     
    /**
     * MainJFrame.java
     *
     * Created on Aug 2, 2013, 11:57:36 PM
     */

    package me.dhanoop.forblog;

    import javax.swing.DefaultCellEditor;
    import javax.swing.JComboBox;
    import javax.swing.table.DefaultTableModel;
    import javax.swing.table.TableCellEditor;

    /**
     *
     * @author dhanoopbhaskar
     */
    public class MainJFrame extends javax.swing.JFrame {

        /** Creates new form MainJFrame */
        public MainJFrame() {
            initComponents();
            customizeTable();
        }

        /** This method is called from within the constructor to
         * initialize the form.
         * WARNING: Do NOT modify this code. The content of this method is
         * always regenerated by the Form Editor.
         */
        @SuppressWarnings("unchecked")
        // 
        private void initComponents() {

            dbScrollPane = new javax.swing.JScrollPane();
            dbTable = new javax.swing.JTable();

            setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

            dbTable.setModel(new javax.swing.table.DefaultTableModel(
                new Object [][] {

                },
                new String [] {
                    "Title 1"
                }
            ));
            dbScrollPane.setViewportView(dbTable);

            javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
            getContentPane().setLayout(layout);
            layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(dbScrollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 169, javax.swing.GroupLayout.PREFERRED_SIZE)
            );
            layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(dbScrollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 81, javax.swing.GroupLayout.PREFERRED_SIZE)
            );

            pack();
        }// 

        /**
        * @param args the command line arguments
        */
        public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new MainJFrame().setVisible(true);
                }
            });
        }

        // Variables declaration - do not modify
        private javax.swing.JScrollPane dbScrollPane;
        private javax.swing.JTable dbTable;
        // End of variables declaration

        private void customizeTable() {
            Object[] columnNames = new Object[1];
            columnNames[0] = "ComboBox";
            Object[][] rowData = new Object[1][1];
            rowData[0][0] = "select gender";
            DefaultTableModel tableModel = new DBTableModel(rowData, columnNames);
            dbTable.setModel(tableModel);
            String[] gender = {"Male", "Female"};
            JComboBox tableData = new JComboBox(gender);
            dbTable.getColumnModel().getColumn(0).setCellEditor(new DefaultCellEditor(tableData));
            dbTable.updateUI();
        }

    }

DBTableModel.java

     
    package me.dhanoop.forblog;

    import javax.swing.table.DefaultTableModel;

    /**
     *
     * @author dhanoopbhaskar
     */
    public class DBTableModel extends DefaultTableModel {

        public DBTableModel(Object[] columns) {
            super(columns, 0);
        }

        public DBTableModel(Object[][] data, Object[] columns) {
            super(data, columns);
        }

        @Override
        public boolean isCellEditable(int row, int column) {
            return true;
        }
    }

The following is the key snippet in the program. What we do here is simply changing the CellEditor of the ColumnModel of the column at position 0 (zero) of the table.

     
        private void customizeTable() {
            Object[] columnNames = new Object[1];
            columnNames[0] = "ComboBox";
            Object[][] rowData = new Object[1][1];
            rowData[0][0] = "select gender";
            DefaultTableModel tableModel = new DBTableModel(rowData, columnNames);
            dbTable.setModel(tableModel);
            String[] gender = {"Male", "Female"};
            JComboBox tableData = new JComboBox(gender);
            dbTable.getColumnModel().getColumn(0).setCellEditor(new DefaultCellEditor(tableData));
            dbTable.updateUI();
        }

Here we use the following constructor of the class DefaultCellEditor.

    public javax.swing.DefaultCellEditor(javax.swing.JComboBox);

In the next post we shall discuss on handling of various events in such combo boxes which are added to the table.