Java Programming

Hello,

I am using repaint() method to redraw the components in my screen. Is there any alternative method. In the code below, i will try to explain what i am trying to do.

class Sample{
JFrame frame = new JFrame();

DrawPanel drawPanel = new DrawPanel();

frame.getContentPane().add(drawPanel);

callMethod();
....
...
.
..
}

public void callMethod()
{
///
///
//
frame.repaint(); //This will call paintComponent again, whether can i do it without repaint() [An alternative approach].
}

//This is class is in a diff file

class DrawPanel extends JPanel{
public void paintComponent(graphics g)
{
Graphics2D g2d = (Graphics2D) g;
drawRec();
}

public void drawRec()
{
g2d.fillRect(x,y,100,203);
}
}


Say on clicking a button, i want to draw rectangle with different sizes. How can i do it without calling repaint().

Please help.
Thank you.