Jtable currency format

Question

I am making a Cellrender with currency format. I placed 13 columns in a jtable, one has the recipes (Salary, 13th salary, Overtime).. and other 12 with the months. each month the person will enter this information and then I will add another jtable with the expenses. someone has an example of Cellrender for that need?

I found this example that suits me well, but I’m not able to use it for a jframe and a defaulttablemode that pulls information from the bank.

import java.awt.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.table.*;

public class EditorTest {

    private JScrollPane getTableComponent() {
        String[] colNames = {
            "Preço", "Número"
        };
        final Object[][] data = {
            {new Double(2), Double.valueOf(12.21)},
            {Double.valueOf(12.21), Double.valueOf(12.21)},
            {Double.valueOf(12.21), Double.valueOf(12.21)},
            {Double.valueOf(12.21), Double.valueOf(12.21)}
        };
        DefaultTableModel model = new DefaultTableModel(data, colNames) {
            public Class getColumnClass(int col) {
                return data[0][col].getClass();
            }
        };
        JTable table = new JTable(model);
        TableColumnModel colModel = table.getColumnModel();
        //colunas
        colModel.getColumn(0).setCellRenderer(new DoubleRenderer());
        colModel.getColumn(1).setCellRenderer(new DoubleRenderer());
        table.setCellSelectionEnabled(true);
        Dimension d = table.getPreferredSize();
        table.setPreferredScrollableViewportSize(d);
        return new JScrollPane(table);
    }

    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new EditorTest().getTableComponent());
        f.pack();
        f.setLocation(100, 100);
        f.setVisible(true);
    }
}

class DoubleRenderer extends DefaultTableCellRenderer {

    NumberFormat numeroFormatado = NumberFormat.getCurrencyInstance();

    public DoubleRenderer() {
        setHorizontalAlignment(RIGHT);
    }

    public Component getTableCellRendererComponent(JTable table,
            Object value,
            boolean isSelected,
            boolean hasFocus,
            int row, int column) {
        super.getTableCellRendererComponent(table, value, isSelected,
                hasFocus, row, column);
        setText(numeroFormatado.format(((Double) value).doubleValue()));
        return this;
    }
}

Answer 1

The example below taken from Soen can serve:

import java.awt.Component;
import java.text.NumberFormat;

import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
public class CurrencyTableCellRenderer extends DefaultTableCellRenderer {

    private static final NumberFormat FORMAT = NumberFormat.getCurrencyInstance();

    @Override
    public final Component getTableCellRendererComponent(JTable table, Object value,
            boolean isSelected, boolean hasFocus, int row, int column) {
        final Component result = super.getTableCellRendererComponent(table, value,
                isSelected, hasFocus, row, column);
        if (value instanceof Number) {
            setHorizontalAlignment(JLabel.RIGHT);
            setText(FORMAT.format(value));
        } else {
            setText("");
        }
        return result;
    }
}

For correct display, you also need to set the data type in this column on TableModel. If using floating point, just return the equivalent type:

@Override
public Class<?> getColumnClass(int columnIndex) {
    return columnIndex == 0 ? Double.class : super.getColumnClass(columnIndex);
}

See working properly:

The method NumberFormat.getCurrencyInstance() return the currency formatting of the location reported by the system and apply to the field whenever a numeric value is passed to the column.

If you want to restrict formatting to a specific currency regardless of the location of the system from which the application is executed, you need to inform the location using another homonymous method:

private static final NumberFormat brazilianFormat = NumberFormat.getCurrencyInstance(new Locale("pt", "BR"));

In the above form, you will always apply the format of the Brazilian currency. See a demonstration of this in IDEONE, the format of which is recovered from the US currency.