Answers to Self-Check Problems - Building Java Programs: A Back to Basics Approach - page 1044

g.fillRect(10, 10, 50, 50);
g.setColor(Color.WHITE);
g.fillOval(10, 10, 50, 50);
3. The problem is that the parameters for the drawRect and drawLine methods have
different meanings. In drawRect , the parameters are (x, y, width, height) ;
in drawLine , they are (x1, y1, x2, y2) . To fix the problem, the third and
fourth parameters passed to drawRect should be changed to 40 and 20 so that the
rectangle's bottom-left corner will be at (50, 40). The following code fixes the
problem:
DrawingPanel panel = new DrawingPanel(200, 100);
Graphics g = panel.getGraphics();
g.drawRect(10, 20, 40, 20);
g.drawLine(10, 20, 50, 40);
4. The Draw7 program draws a series of progressively smaller black circles, each
with its right and bottom edges touching the right and bottom corners of the win-
dow. Its output looks like this:
Chapter 4
1. (a) z % 2 != 0
(b) z <= Math.sqrt(y)
(c) y > 0
(d) x % 2 != y % 2
(e) y % z == 0
(f) z != 0
(g) Math.abs(y) > Math.abs(z)
(h) (x >= 0) == (z < 0)
(i) y % 10 == y
(j) z >= 0
(k) x % 2 == 0
(l) Math.abs(x - y) < Math.abs(z - y)