Specifying number of decimal places in Jtable
Hi,
I have implemented a table and require a number to be displayed with four digit precision eg. 0.7827
Any suggestions on how to do this? I can't seem to work out how to do it using cellRender
Thanks,
Dave
Here's an example:
import java.awt.*;
import java.text.DecimalFormat;
import javax.swing.*;
import javax.swing.table.*;
public class TableRendererDoubleExample extends JFrame {
public static void main( String[] args ) {
TableRendererDoubleExample frame = new TableRendererDoubleExample();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setSize( 200, 200 );
frame.setLocationRelativeTo( null );
frame.setVisible( true );
public TableRendererDoubleExample() {
Object[] columnNames = { "Precision", "Double" };
Object[][] data = {
{ "Default", new Double( 80.503 ) },
{ "Default", new Double( 6.254 ) },
{ "Default", new Double( 7.3532 ) },
{ "Default", new Double( 236.0043 ) },
{ "4", new Double( 86.03 ) },
{ "Default", new Double( 2.2 ) },
{ "Default", new Double( 0.0323 ) },
{ "4", new Double( 3.14159 ) },
{ "Default", new Double( 1.14123 ) } };
DefaultTableModel model = new DefaultTableModel( data, columnNames ) {
public Class getColumnClass( int columnIndex ) {
if ( columnIndex == 1 ) return Double.class;
return super.getColumnClass( columnIndex );
JTable table = new JTable( model );
table.setDefaultRenderer( Double.class, new DoubleRenderer() );
JScrollPane scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
static class DoubleRenderer extends DefaultTableCellRenderer {
DecimalFormat formatter = new DecimalFormat( "#.0000" );
public Component getTableCellRendererComponent( JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column ) {
Component rend = super.getTableCellRendererComponent( table, value, isSelected, hasFocus, row, column );
if ( needFourDigitPrecision( row ) ) {
String text = formatter.format( value );
( (JLabel) rend ).setText( text );
return rend;
private boolean needFourDigitPrecision( int row ) {
return ( row == 4 || row == 7 );
}
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