In class examples 2023-11-06

LetterCount.java

import java.util.Scanner;

/**
 * Demonstrates the relationship between arrays and strings.
 * 
 * @author Java Foundations
 */
public class LetterCount
{
	/**
	 * Reads a sentence from the user and counts the number of upper case and
	 * lower case letters contained in it.
	 * 
	 * @param args
	 */
	public static void main(String[] args)
	{
		final int NUMCHARS = 26;
		int[] upper = new int[NUMCHARS];
		int[] lower = new int[NUMCHARS];

		Scanner scan = new Scanner(System.in);
		char current; // the current character being processed
		int other = 0; // counter for non-alphabetics

		String line = scan.nextLine();
		// while(scan.hasNextLine())
		{
			// System.out.println("Enter a sentence:");
			

			// Count the number of each letter occurrence
			for(int ch = 0; ch < line.length(); ch++)
			{
				current = line.charAt(ch);
				if(current >= 'A' && current <= 'Z')
				{
					upper[current - 'A']++;
				}
				else if(current >= 'a' && current <= 'z')
				{
					lower[current - 'a']++;
				}
				else
				{
					other++;
				}
			}
		}
		scan.close(); // done with scanner.

		// Print the results
		System.out.println();
		for (int letter = 0; letter < upper.length; letter++) {
			System.out.print((char) (letter + 'A'));
			System.out.print(": " + upper[letter]);
			System.out.print("\t\t" + (char) (letter + 'a'));
			System.out.println(": " + lower[letter]);
		}

		System.out.println();
		System.out.println("Non-alphabetic characters: " + other);
	}
}