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

GUI and Graphics Case Study Exercises

6.1 Using method fillOval, draw a bull’s-eye that alternates between two random colors, as in Fig. 6.13. Use the constructor Color(int r, int g, int b) with random arguments to generate random colors.

Fig. 6.13 | A bulls-eye with two alternating, random colors.

6.2 Create a program that draws 10 random filled shapes in random colors, positions and sizes (Fig. 6.14). Method paintComponent should contain a loop that iterates 10 times. In each iteration, the loop should determine whether to draw a filled rectangle or an oval, create a random color and choose coordinates and dimensions at random. The coordinates ...