JAVA from book ''Introduction to Java Programming, Tenth Edition Y. Daniel Liang"

Question

what is the problem in line 7 and 29 of this code ????

package countlettersinarray;

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') + " ");
}
}
}

Answer 1

do you mind putting it inside the code playground and then posting it here please