Java RGB colors

public RGBpanel()
{
setPreferredSize(new Dimension(300,300));
int red = Integer.parseInt(JOptionPane.showInputDialog("Ente r red value"));
int green = Integer.parseInt(JOptionPane.showInputDialog("Ente r green value"));
int blue = Integer.parseInt(JOptionPane.showInputDialog("Ente r blue value"));
Color colr = new Color(red,green,blue);
setBackground(colr);
}