SINGLE-DIMENSIONAL ARRAYS - Introduction to Java Programming: Comprehensive Version - page 262

11 // Count the occurrences of each letter

12 int [] counts = countLetters(chars);

return array

13
14 // Display counts
15 System.out.println();
16 System.out.println( "The occurrences of each letter are:" );
17 displayCounts(counts);

pass array

18 }
19
20

/** Create an array of characters */

21 public static char [] createArray() {

22 // Declare an array of characters and create it

23 char [] chars = new char [ 100 ];

24
25 // Create lowercase letters randomly and assign
26 // them to the array
27 for ( int i = 0 ; i < chars.length; i++)
28 chars[i] = RandomCharacter.getRandomLowerCaseLetter();
29
30 // Return the array

31 return chars;

32 }
33
34 /** Display the array of characters */
35 public static void displayArray( char [] chars) {
36 // Display the characters in the array 20 on each line
37 for ( int i = 0 ; i < chars.length; i++) {
38 if ((i + 1 ) % 20 == 0 )
39 System.out.println(chars[i]);
40 else
41 System.out.print(chars[i] + " " );
42 }
43 }
44
45 /** Count the occurrences of each letter */

46 public static int [] countLetters( char [] chars) {

47 // Declare and create an array of 26 int

48 int [] counts = new int [ 26 ];

49
50 // For each lowercase letter in the array, count it
51 for ( int i = 0 ; i < chars.length; i++)
52 counts[chars[i] - 'a' ]++;
53
54

increase count

return counts;

55 }
56
57 /** Display counts */
58 public static void displayCounts( int [] counts) {
59 for ( int i = 0 ; i < counts.length; i++) {
60 if ((i + 1 ) % 10 == 0 )
61 System.out.println(counts[i] + " " + ( char )(i + 'a' ));
62 else
63 System.out.print(counts[i] + " " + ( char )(i + 'a' ) + " " );
64 }
65 }
66 }