Java™ How To Program (Early Objects), Tenth Edition

Drawing in Different Colors

Figures 13.5–13.6 demonstrate several methods from Fig. 13.4 by drawing filled rectangles and Strings in several different colors. When the application begins execution, class ColorJPanel’s paintComponent method (lines 10–37 of Fig. 13.5) is called to paint the window. Line 17 uses Graphics method setColor to set the drawing color. Method setColor receives a Color object. The expression new Color(255, 0, 0) creates a new Color object that represents red (red value 255, and 0 for the green and blue values). Line 18 uses Graphics method fillRect to draw a filled rectangle in the current color. Method fillRect draws a rectangle based on its four arguments. The first two integer values represent the upper-left x-coordinate ...