Question

I want to color specific rows in jTable..i did it for columns by using this code,

private class CustomCellRenderer extends DefaultTableCellRenderer {

/* (non-Javadoc)
 * @see    
javax.swing.table.DefaultTableCellRenderer#getTableCellRendererComponent(javax.swing.JTable, java.lang.Object, boolean, boolean, int, int)
 */

    @Override
public Component  getTableCellRendererComponent(JTable table, Object value,boolean isSelected, boolean hasFocus, int row, int column) {

  Component rendererComp = super.getTableCellRendererComponent(table, value, isSelected, hasFocus,row, column);

//Set foreground color
// rendererComp.setForeground(Color.red);
//Set background color
  rendererComp .setBackground(Color.pink);

 return rendererComp ;
 }

}

And i call the above code using,

 jTable1.getColumnModel().getColumn(3).setCellRenderer(new CustomCellRenderer());

But i want to do the same for rows in jTable..There’s no getColumnModel() or getColumn() in the case of rows..So what’s the alternate way for doing that? I am doing it in Netbeans by using Java Swing..

Answer 1

Here is an example on how you can combine both column colors and row color. You basically perform tests in the TableCellRenderer to see if the background should be of one color or another.

import java.awt.Color;
import java.awt.Component;
import java.util.Enumeration;
import java.util.Vector;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;

public class TestTable {

    public class MyTableCellRenderer extends DefaultTableCellRenderer implements TableCellRenderer {

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
            setBackground(null);
            super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
            setText(String.valueOf(value));
            boolean interestingRow = row % 5 == 2;
            boolean secondColumn = column == 1;
            if (interestingRow && secondColumn) {
                setBackground(Color.ORANGE);
            } else if (interestingRow) {
                setBackground(Color.YELLOW);
            } else if (secondColumn) {
                setBackground(Color.RED);
            }
            return this;
        }

    }

    private JFrame f;
    private JTable table;

    protected void initUI() {
        Vector<Vector<Object>> data = new Vector<Vector<Object>>();
        Vector<String> columNames = new Vector<String>();
        columNames.add("Col 0");
        columNames.add("Col 1");
        columNames.add("Col 2");
        for (int i = 0; i < 20; i++) {
            Vector<Object> v = new Vector<Object>();
            v.add(i % 3 == 0 ? "Hello" : "World");
            v.add("Some data in row " + (i + 1));
            v.add("Some other data in row " + (i + 1));
            data.add(v);
        }
        table = new JTable(new DefaultTableModel(data, columNames));
        Enumeration<TableColumn> en = table.getColumnModel().getColumns();
        while (en.hasMoreElements()) {
            TableColumn tc = en.nextElement();
            tc.setCellRenderer(new MyTableCellRenderer());
        }
        f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setLocationRelativeTo(null);
        f.add(new JScrollPane(table));
        f.pack();
        f.setVisible(true);

    }

    public static void main(String[] args) {

        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new TestTable().initUI();
            }
        });
    }

}