Fraction Currency Table : Grid Table « Swing Components « Java

Fraction Currency Table

Fraction Currency Table
Core SWING Advanced Programming 
By Kim Topley
ISBN: 0 13 083292 8       
Publisher: Prentice Hall  

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.NumberFormat;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableColumnModel;

public class FractionCurrencyTable {
  public static void main(String[] args) {
    try {
    } catch (Exception evt) {}
    JFrame f = new JFrame("Fraction Currency Table");
    JTable tbl = new JTable(new CurrencyTableModel());
        new FractionCellRenderer(10, 3, SwingConstants.RIGHT));

    TableColumnModel tcm = tbl.getColumnModel();


    JScrollPane sp = new JScrollPane(tbl);
    f.getContentPane().add(sp, "Center");
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent evt) {

class DataWithIcon {
  public DataWithIcon(Object data, Icon icon) { = data;
    this.icon = icon;

  public Icon getIcon() {
    return icon;

  public Object getData() {
    return data;

  public String toString() {
    return data.toString();

  protected Icon icon;

  protected Object data;

class CurrencyTableModel extends AbstractTableModel {
  protected String[] columnNames = { "Currency", "Yesterday", "Today",
      "Change" };

  // Constructor: calculate currency change to create the last column
  public CurrencyTableModel() {
    for (int i = 0; i < data.length; i++) {
      data[i][DIFF_COLUMN] = new Double(
          ((Double) data[i][NEW_RATE_COLUMN]).doubleValue()
              - ((Double) data[i][OLD_RATE_COLUMN]).doubleValue());

  // Implementation of TableModel interface
  public int getRowCount() {
    return data.length;

  public int getColumnCount() {
    return COLUMN_COUNT;

  public Object getValueAt(int row, int column) {
    return data[row][column];

  public Class getColumnClass(int column) {
    return (data[0][column]).getClass();

  public String getColumnName(int column) {
    return columnNames[column];

  protected static final int OLD_RATE_COLUMN = 1;

  protected static final int NEW_RATE_COLUMN = 2;

  protected static final int DIFF_COLUMN = 3;

  protected static final int COLUMN_COUNT = 4;

  protected static final Class thisClass = CurrencyTableModel.class;

  protected Object[][] data = new Object[][] {
          new DataWithIcon("Belgian Franc", new ImageIcon(thisClass
          new Double(37.6460110), new Double(37.6508921), null },
          new DataWithIcon("British Pound", new ImageIcon(thisClass
              .getResource("gb.gif"))), new Double(0.6213051),
          new Double(0.6104102), null },
          new DataWithIcon("Canadian Dollar", new ImageIcon(thisClass
          new Double(1.4651209), new Double(1.5011104), null },
          new DataWithIcon("French Franc", new ImageIcon(thisClass
          new Double(6.1060001), new Double(6.0100101), null },
          new DataWithIcon("Italian Lire", new ImageIcon(thisClass
          new Double(1181.3668977), new Double(1182.104), null },
          new DataWithIcon("German Mark", new ImageIcon(thisClass
          new Double(1.8191804), new Double(1.8223421), null },
          new DataWithIcon("Japanese Yen", new ImageIcon(thisClass
          new Double(141.0815412), new Double(121.0040432), null } };

class FractionCellRenderer extends DefaultTableCellRenderer {
  public FractionCellRenderer(int integer, int fraction, int align) {
    this.integer = integer; // maximum integer digits
    this.fraction = fraction; // exact number of fraction digits
    this.align = align; // alignment (LEFT, CENTER, RIGHT)

  protected void setValue(Object value) {
    if (value != null && value instanceof Number) {
      setText(formatter.format(((Number) value).doubleValue()));
    } else {

  protected int integer;

  protected int fraction;

  protected int align;

  protected static NumberFormat formatter = NumberFormat.getInstance();


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