/* * TableDemo.java requires no other files. */import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTable;import javax.swing.table.AbstractTableModel;import java.awt.Dimension;import java.awt.GridLayout;/**  * TableDemo is just like SimpleTableDemo, except that it * uses a custom TableModel. */public class TableDemo extends JPanel {    private boolean DEBUG = false;    public TableDemo() {        super(new GridLayout(1,0));        JTable table = new JTable(new MyTableModel());        table.setPreferredScrollableViewportSize(new Dimension(500, 70));        //Create the scroll pane and add the table to it.        JScrollPane scrollPane = new JScrollPane(table);        //Add the scroll pane to this panel.        add(scrollPane);    }    class MyTableModel extends AbstractTableModel {        private String[] columnNames = {"First Name",                                        "Last Name",                                        "Sport",                                        "# of Years",                                        "Vegetarian"};        private Object[][] data = {            {"Mary", "Campione",             "Snowboarding", new Integer(5), new Boolean(false)},            {"Alison", "Huml",             "Rowing", new Integer(3), new Boolean(true)},            {"Kathy", "Walrath",             "Knitting", new Integer(2), new Boolean(false)},            {"Sharon", "Zakhour",             "Speed reading", new Integer(20), new Boolean(true)},            {"Philip", "Milne",             "Pool", new Integer(10), new Boolean(false)},            {"Isaac", "Rabinovitch",                 "Nitpicking", new Integer(1000), new Boolean(false)}        };        public int getColumnCount() {            return columnNames.length;        }        public int getRowCount() {            return data.length;        }        public String getColumnName(int col) {            return columnNames[col];        }        public Object getValueAt(int row, int col) {            return data[row][col];        }        /*         * JTable uses this method to determine the default renderer/         * editor for each cell.  If we didn't implement this method,         * then the last column would contain text ("true"/"false"),         * rather than a check box.         */        public Class getColumnClass(int c) {            return getValueAt(0, c).getClass();        }        /*         * Don't need to implement this method unless your table's         * editable.         */        public boolean isCellEditable(int row, int col) {            //Note that the data/cell address is constant,            //no matter where the cell appears onscreen.            if (col < 2) {                return false;            } else {                return true;            }        }        /*         * Don't need to implement this method unless your table's         * data can change.         */        public void setValueAt(Object value, int row, int col) {            if (DEBUG) {                System.out.println("Setting value at " + row + "," + col                                   + " to " + value                                   + " (an instance of "                                   + value.getClass() + ")");            }            data[row][col] = value;            fireTableCellUpdated(row, col);            if (DEBUG) {                System.out.println("New value of data:");                printDebugData();            }        }        private void printDebugData() {            int numRows = getRowCount();            int numCols = getColumnCount();            for (int i=0; i < numRows; i++) {                System.out.print("    row " + i + ":");                for (int j=0; j < numCols; j++) {                    System.out.print("  " + data[i][j]);                }                System.out.println();            }            System.out.println("--------------------------");        }    }    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        //Create and set up the window.        JFrame frame = new JFrame("TableDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Create and set up the content pane.        TableDemo newContentPane = new TableDemo();        newContentPane.setOpaque(true); //content panes must be opaque        frame.setContentPane(newContentPane);        //Display the window.        frame.pack();        frame.setVisible(true);    }    public static void main(String[] args) {        //Schedule a job for the event-dispatching thread:        //creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }}