A table with the ability to play with row and column selections : Table « Swing JFC « Java

A table with the ability to play with row and column selections

A table with the ability to play with row and column selections
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
// SelectionExample.java
//A simple multiplication table with the ability to play with row and column
//selections. You can alter the cell, column and row selection properties
//of the table at runtime.

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;

public class SelectionExample extends JFrame {

  public SelectionExample() {
    super("Selection Model Test");
    setSize(450, 350);

    TableModel tm = new AbstractTableModel() {
      // We'll create a simple multiplication table to serve as a
      // noneditable
      // table with several rows and columns
      public int getRowCount() {
        return 10;

      public int getColumnCount() {
        return 10;

      public Object getValueAt(int r, int c) {
        return "" + (r + 1) * (c + 1);

    final JTable jt = new JTable(tm);

    JScrollPane jsp = new JScrollPane(jt);
    getContentPane().add(jsp, BorderLayout.CENTER);

    // Now set up our selection controls
    JPanel controlPanel, buttonPanel, columnPanel, rowPanel;

    buttonPanel = new JPanel();
    final JCheckBox cellBox, columnBox, rowBox;
    cellBox = new JCheckBox("Cells", jt.getCellSelectionEnabled());
    columnBox = new JCheckBox("Columns", jt.getColumnSelectionAllowed());
    rowBox = new JCheckBox("Rows", jt.getRowSelectionAllowed());
    cellBox.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {

    columnBox.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {

    rowBox.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {

    buttonPanel.add(new JLabel("Selections allowed:"));

    columnPanel = new JPanel();
    ListSelectionModel csm = jt.getColumnModel().getSelectionModel();
    JLabel columnCounter = new JLabel("(Selected Column Indices Go Here)");
    csm.addListSelectionListener(new SelectionDebugger(columnCounter, csm));
    columnPanel.add(new JLabel("Selected columns:"));

    rowPanel = new JPanel();
    ListSelectionModel rsm = jt.getSelectionModel();
    JLabel rowCounter = new JLabel("(Selected Row Indices Go Here)");
    rsm.addListSelectionListener(new SelectionDebugger(rowCounter, rsm));
    rowPanel.add(new JLabel("Selected rows:"));

    controlPanel = new JPanel(new GridLayout(0, 1));

    getContentPane().add(controlPanel, BorderLayout.SOUTH);

  public static void main(String args[]) {
    SelectionExample se = new SelectionExample();

  public class SelectionDebugger implements ListSelectionListener {
    JLabel debugger;

    ListSelectionModel model;

    public SelectionDebugger(JLabel target, ListSelectionModel lsm) {
      debugger = target;
      model = lsm;

    public void valueChanged(ListSelectionEvent lse) {
      if (!lse.getValueIsAdjusting()) {
        // skip all the intermediate events . . .
        StringBuffer buf = new StringBuffer();
        int[] selection = getSelectedIndices(model
            .getMinSelectionIndex(), model.getMaxSelectionIndex());
        if (selection.length == 0) {
        } else {
          for (int i = 0; i < selection.length - 1; i++) {
            buf.append(", ");
          buf.append(selection[selection.length - 1]);

    // This method returns an array of selected indices. It's guaranteed to
    // return a nonnull value.
    protected int[] getSelectedIndices(int start, int stop) {
      if ((start == -1) || (stop == -1)) {
        // no selection, so return an empty array
        return new int[0];

      int guesses[] = new int[stop - start + 1];
      int index = 0;
      // manually walk through these . . .
      for (int i = start; i <= stop; i++) {
        if (model.isSelectedIndex(i)) {
          guesses[index++] = i;

      // ok, pare down the guess array to the real thing
      int realthing[] = new int[index];
      System.arraycopy(guesses, 0, realthing, 0, index);
      return realthing;


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