Java: SimpleTableDemo

/*
 * SimpleTableDemo.java không yêu cầu file ngoài.
 */

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class SimpleTableDemo extends JPanel {
  private boolean DEBUG = false;

  public SimpleTableDemo() {
    super(new GridLayout(1, 0));

    String[] columnNames = {"First Name",
      "Last Name",
      "Sport",
      "# of Years",
      "Vegetarian"};

    Object[][] data = {
      {"Kathy", "Smith",
        "Snowboarding", new Integer(5), new Boolean(false)},
      {"John", "Doe",
        "Rowing", new Integer(3), new Boolean(true)},
      {"Sue", "Black",
        "Knitting", new Integer(2), new Boolean(false)},
      {"Jane", "White",
        "Speed reading", new Integer(20), new Boolean(true)},
      {"Joe", "Brown",
        "Pool", new Integer(10), new Boolean(false)}
    };

    final JTable table = new JTable(data, columnNames);
    table.setPreferredScrollableViewportSize(new Dimension(500, 70));
    table.setFillsViewportHeight(true);

    if (DEBUG) {
      table.addMouseListener(new MouseAdapter() {
        public void mouseClicked(MouseEvent e) {
          printDebugData(table);
        }
      });
    }

    //Create the scroll pane and add the table to it.
    JScrollPane scrollPane = new JScrollPane(table);

    //Add the scroll pane to this panel.
    add(scrollPane);
  }

  private void printDebugData(JTable table) {
    int numRows = table.getRowCount();
    int numCols = table.getColumnCount();
    javax.swing.table.TableModel model = table.getModel();

    System.out.println("Value of data: ");
    for (int i = 0; i < numRows; i++) {
      System.out.print(" row " + i + ":");
      for (int j = 0; j < numCols; j++) {
        System.out.print(" " + model.getValueAt(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("SimpleTableDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Create and set up the content pane.
    SimpleTableDemo newContentPane = new SimpleTableDemo();
    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();
      }
    });
  }
}