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Copy pathCountLettersInArray.java
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66 lines (55 loc) · 1.81 KB
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public class CountLettersInArray {
/** Main method */
public static void main(String args[]) {
// Declare and create an array
char[] chars = createArray();
// Display the array
System.out.println("The lowercase letters are:");
displayArray(chars);
// Count the occurrences of each letter
int[] counts = countLetters(chars);
// Display counts
System.out.println();
System.out.println("The occurrences of each letter are:");
displayCounts(counts);
}
/** Create an array of characters */
public static char[] createArray() {
// Declare an array of characters and create it
char[] chars = new char[100];
// Create lowercase letters randomly and assign
// them to the array
for (int i = 0; i < chars.length; i++)
chars[i] = RandomCharacter.getRandomLowerCaseLetter();
// Return the array
return chars;
}
/** Display the array of characters */
public static void displayArray(char[] chars) {
// Display the characters in the array 20 on each line
for (int i = 0; i < chars.length; i++) {
if ((i + 1) % 20 == 0)
System.out.println(chars[i]);
else
System.out.print(chars[i] + " ");
}
}
/** Count the occurrences of each letter */
public static int[] countLetters(char[] chars) {
// Declare and create an array of 26 int
int[] counts = new int[26];
// For each lowercase letter in the array, count it
for (int i = 0; i < chars.length; i++)
counts[chars[i] - 'a']++;
return counts;
}
/** Display counts */
public static void displayCounts(int[] counts) {
for (int i = 0; i < counts.length; i++) {
if ((i + 1) % 10 == 0)
System.out.println(counts[i] + " " + (char)(i + 'a'));
else
System.out.print(counts[i] + " " + (char)(i + 'a') + " ");
}
}
}