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<p>The idea is to implement a <code>TableModel</code> so that it automatically returns the result of the product of unit and amount. Here is a small demonstration of what I mean (to add a new row, simply double click below the table):</p> <pre><code>import java.awt.BorderLayout; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.util.Vector; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.SwingUtilities; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.table.DefaultTableModel; public class TestTable3 { protected void initUI() { final DefaultTableModel model = new DefaultTableModel() { @Override public Class<?> getColumnClass(int columnIndex) { switch (columnIndex) { case 0: return Integer.class; case 1: case 2: return Double.class; } return super.getColumnClass(columnIndex); } @Override public Object getValueAt(int row, int column) { if (column == 2) { Integer i = (Integer) getValueAt(row, 0); Double d = (Double) getValueAt(row, 1); if (i != null && d != null) { return i * d; } else { return 0.0; } } return super.getValueAt(row, column); } @Override public boolean isCellEditable(int row, int column) { return column == 0 || column == 1; } @Override public void setValueAt(Object aValue, int row, int column) { super.setValueAt(aValue, row, column); fireTableCellUpdated(row, 2); } @Override public String getColumnName(int column) { switch (column) { case 0: return "Quantity"; case 1: return "Price"; case 2: return "Total"; } return super.getColumnName(column); } @Override public int getColumnCount() { return 3; } }; final JTable table = new JTable(model); table.setFillsViewportHeight(true); table.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { if (e.getClickCount() == 2) { if (table.rowAtPoint(e.getPoint()) < 0) { model.addRow(new Vector()); } } } }); model.addRow(new Vector()); JFrame frame = new JFrame(TestTable3.class.getSimpleName()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JScrollPane scrollpane = new JScrollPane(table); frame.add(scrollpane, BorderLayout.CENTER); frame.pack(); frame.setVisible(true); } public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.invokeLater(new Runnable() { @Override public void run() { new TestTable3().initUI(); } }); } } </code></pre> <p>And the result: <img src="https://i.stack.imgur.com/nVuP1.png" alt="Result"></p>
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1. POMultiplication between two cells of a JTable in Java
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