Non sono io l'autore di questo codice, ma l'ho provato per una cosa che interessava a mè e funziona
import java.awt.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.border.LineBorder;
import javax.swing.table.*;
public class TablePrepareRenderer extends JFrame {
private static final long serialVersionUID = 1L;
private JTable table;
private Date maturityDate = new Date();
private Date todayDate = new Date();
private SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy");
private Date tableDate = new Date();
private String strDate = "";
private Date modifDate = new Date();
private Calendar cal;
public TablePrepareRenderer() {
Object[] columnNames = {"Type", "Company", "Shares", "Price", "Date"};
Object[][] data = {
{"Buy", "IBM", new Integer(1000), new Double(80.50), new Date()},
{"Sell", "MicroSoft", new Integer(2000), new Double(6.25), new Date()},
{"Sell", "Apple", new Integer(3000), new Double(7.35), new Date()},
{"Buy", "Nortel", new Integer(4000), new Double(20.00), new Date()}
};
DefaultTableModel model = new DefaultTableModel(data, columnNames) {
private static final long serialVersionUID = 1L;
@Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
table = new JTable(model) {
private static final long serialVersionUID = 1L;
@Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
Component c = super.prepareRenderer(renderer, row, column);
/*int firstRow = 0;
int lastRow = table.getRowCount() - 1;
if (row == lastRow) {
((JComponent) c).setBackground(Color.red);
} else if (row == firstRow) {
((JComponent) c).setBackground(Color.blue);
} else {
((JComponent) c).setBackground(table.getBackground());
}*/
if (!isRowSelected(row)) {
if (table.getColumnCount() >= 0) {
String type = (String) getModel().getValueAt(row, 0);
c.setBackground("Buy".equals(type) ? Color.YELLOW : Color.GREEN);
//
maturityDate = new Date();
todayDate = new Date();
strDate = sdf.format(todayDate);
try {
todayDate = sdf.parse(strDate);
} catch (ParseException ex) {
Logger.getLogger(TablePrepareRenderer.class.getName()).log(Level.SEVERE, null, ex);
}
tableDate = (Date) table.getValueAt(row, 4);
strDate = sdf.format(tableDate);
if (strDate != null) {
if (!strDate.isEmpty()) {
try {
maturityDate = sdf.parse(strDate);
} catch (ParseException ex) {
Logger.getLogger(TablePrepareRenderer.class.getName()).log(Level.SEVERE, null, ex);
}
if (maturityDate != null) {
int mmDiffDealToValue = (maturityDate).compareTo(todayDate);
if (((mmDiffDealToValue < 0))) {
c.setBackground(Color.orange);
c.setFont(new Font("Serif", Font.BOLD, 12));
}
}
}
}
//
}
}
if (isRowSelected(row) && isColumnSelected(column)) {
((JComponent) c).setBorder(new LineBorder(Color.red));
}
return c;
}
};
modifyDateInTable();
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane(table);
getContentPane().add(scrollPane);
}
private void modifyDateInTable() {
Calendar c = Calendar.getInstance();
c.setTime(modifDate);
c.add(Calendar.DATE, - 1);
modifDate = c.getTime();
table.setValueAt(modifDate, 0, 4);
c.setTime(modifDate);
c.add(Calendar.DATE, +5);
modifDate = c.getTime();
table.setValueAt(modifDate, 1, 4);
c.setTime(modifDate);
c.add(Calendar.DATE, +1);
modifDate = c.getTime();
table.setValueAt(modifDate, 1, 4);
c.setTime(modifDate);
c.add(Calendar.DATE, - 16);
modifDate = c.getTime();
table.setValueAt(modifDate, 3, 4);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
TablePrepareRenderer frame = new TablePrepareRenderer();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setLocation(150, 150);
frame.setVisible(true);
}
});
}
}