Java How to Program Fourth Edition - DCC

Chapter 7 Arrays 323
15 // add each element's value to total
16 for ( int counter = 0; counter < array.length; counter++ )
17 total += array[ counter ];
18
19 JOptionPane.showMessageDialog( null,
20 "Total of array elements: " + total,
21 "Sum the Elements of an Array",
22 JOptionPane.INFORMATION_MESSAGE );
23
24 System.exit( 0 );
25 }
26 }
Fig. Fig. 7.6 7.6 Computing the sum of the elements of an array (part 2 of 2).
7.4.5 Using Histograms to Display Array Data Graphically
Many programs present data to users in a graphical manner. For example, numeric values
are often displayed as bars in a bar chart. In such a chart, longer bars represent larger numeric
values. One simple way to display numeric data graphically is with a histogram that
shows each numeric value as a bar of asterisks (*).
Our next application (Fig. 7.7) reads numbers from an array and graphs the information
in the form of a bar chart (or histogram). The program displays each number followed
by a bar consisting of that many asterisks. The nested for loop (lines 17–24) appends the
bars to the String that will be displayed in JTextArea outputArea on a message
dialog. Note the loop continuation condition of the inner for structure at line 22
(stars