import java.awt.Color;
import javax.swing.JTable;
import javax.swing.table.*;
public class ColorTable extends JTable {
/** Creates a new instance of ColorTable */
private DefaultTableCellRenderer oddRenderer;
private DefaultTableCellRenderer evenRenderer;
public ColorTable() {
super();
}
public ColorTable(TableModel tm) {
super(tm);
}
public ColorTable(Object[][] data, Object[] columns) {
super(data, columns);
}
public ColorTable(int rows, int columns) {
super(rows, columns);
}
/**
* If row is an even number, getCellRenderer() returns a DefaultTableCellRenderer
* with white background. For odd rows, this method returns a DefaultTableCellRenderer
* with a light gray background.
*/
@Override
public TableCellRenderer getCellRenderer(int row, int column) {
TableCellRenderer cellRenderer;
if (oddRenderer == null) {
oddRenderer = new DefaultTableCellRenderer();
}
if (evenRenderer == null) {
evenRenderer = new DefaultTableCellRenderer();
evenRenderer.setBackground(new Color(181, 230, 29));
}
cellRenderer = ((row%2)==0)? oddRenderer : evenRenderer;
return cellRenderer;
}
} 
Kéo một JTable vào trong form (NetBean), sau đó trong phần Custom Creation Code thêm dòng
new ColorTable()Thế là xong :D

tuyệt quá, đúng thứ mình cần, cảm ơn cậu rất nhiềuuuuuuuuuuuuuuuu
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