Primitive Data and Definite Loops - Building Java Programs: A Back to Basics Approach - page 111

Table 2.9 Analysis of Figure

Line Spaces Dots Spaces

1 0 4 0

2 1 2 1

3 2 0 2

Initial Structured Version
The pseudocode for the top half of the hourglass is easily translated into a static
method called drawTop . A similar solution exists for the bottom half of the hour-
glass. Put together, the program looks like this:

1 public class DrawFigure {
2 public static void main(String[] args) {
3 drawLine();
4 drawTop();
5 drawBottom();
6 drawLine();
7 }
8
9 // produces a solid line
10 public static void drawLine() {
11 System.out.print("+");
12 for ( int i = 1; i <= 6; i++) {
13 System.out.print("-");
14 }
15 System.out.println("+");
16 }
17
18 // produces the top half of the hourglass figure
19 public static void drawTop() {
20 for ( int line = 1; line <= 3; line++) {
21 System.out.print("|");
22 for ( int i = 1; i <= (line - 1); i++) {
23 System.out.print(" ");
24 }
25 System.out.print("\\");
26 for ( int i = 1; i <= (6 - 2 * line); i++) {
27 System.out.print(".");
28 }
29 System.out.print("/");
30 for ( int i = 1; i <= (line - 1); i++) {
31 System.out.print(" ");
32 }