java awt graphics tutorial

1//For Drawing Text
2g.drawString("Hello", 10, 10);
3// For Drawing Images
4g.drawImage(img, 
5            0, 0, width, height,
6            0, 0, imageWidth, imageHeight,
7            null);                    
8
9// For Drawing Shapes
10g2.draw(new Line2D.Double(0, 0, 30, 40));
11