Java code works fine but it will not show the \'z\' character and how many there

Question

Java code works fine but it will not show the 'z' character and how many there are. Problem comes from Java an introduction to problem solving and programing 7th edition. Chapter 7 Programing Problem 1

import java.util.Scanner;
public class C7P1
{
public static void main(String[] args)
{
Scanner keyboard = new Scanner(System.in);

int array[] = new int[26];
String line = "",keepOn;
int i;
char ch;
int counter=0;

do
{
System.out.println(" Put in a line finished with a period(.)");
line= keyboard.nextLine();

line=line.toLowerCase();
int allLetters= line.length()-1;

while (counter<allLetters)
{
ch=line.charAt(counter);
if(ch==' '||ch>='0' &&ch<='9')
counter++;
else
{
array[getIndex(line.charAt(counter))]++;
counter++;

}
}
for (i=0, ch='a'; ch<'z'; ch++,i++)
if(array[i]!=0)
System.out.println (ch+" "+array[i]);


System.out.println(" Continue? 'y'[ENTER]'y'[ENTER] or 'n' [ENTER]'n'[ENTER]");
keyboard.nextLine();
keepOn = keyboard.nextLine();

if(keepOn.equals('y'))
{
line="";
counter=0;
for(int K=0;K<26;K++)
array[K]=0;
}
}
while (keepOn.equals ("y"));
}//end main

public static int getIndex(char ch)
{
return (int)ch-'a';
}

}//end class

Explanation / Answer

The issue with z character is because in the last for loop, it should be ch<='z' rather than simple ch<'z' .

Corrected full code is shown below :

import java.util.Scanner;
public class C7P1
{
public static void main(String[] args)
{
Scanner keyboard = new Scanner(System.in);

int array[] = new int[26];
String line = "",keepOn;
int i;
char ch;
int counter=0;

do
{
System.out.println(" Put in a line finished with a period(.)");
line= keyboard.nextLine();

line=line.toLowerCase();
int allLetters= line.length()-1;

while (counter<allLetters)
{
ch=line.charAt(counter);
if(ch==' '||ch>='0' &&ch<='9')
counter++;
else
{
array[getIndex(line.charAt(counter))]++;
counter++;

}
}
for (i=0, ch='a'; ch<='z'; ch++,i++)
if(array[i]!=0)
System.out.println (ch+" "+array[i]);


System.out.println(" Continue? 'y'[ENTER]'y'[ENTER] or 'n' [ENTER]'n'[ENTER]");
keyboard.nextLine();
keepOn = keyboard.nextLine();

if(keepOn.equals('y'))
{
line="";
counter=0;
for(int K=0;K<26;K++)
array[K]=0;
}
}
while (keepOn.equals ("y"));
}//end main

public static int getIndex(char ch)
{
return (int)ch-'a';
}

}//end class

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