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Java Program to Print Alphabets from A to Z

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The English alphabet has 26 letters. In Java, a char is stored as a number, and the letters have consecutive values: 'A' to 'Z' are 65 to 90, and 'a' to 'z' are 97 to 122. That means a loop can count through letters just like through numbers.

1. Print Uppercase Alphabets Using a char Loop

The loop variable is a char. ch++ moves it to the next letter.

PrintAlphabets.java 
public class PrintAlphabets {
    public static void main(String[] args) {
        for (char ch = 'A'; ch <= 'Z'; ch++) {
            System.out.print(ch + " ");
        }
        System.out.println();
    }
}
Output
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

2. Print Lowercase Alphabets Using ASCII Values

This version loops over the numbers 97 to 122 and casts each one to char to print the letter.

PrintLowercase.java 
public class PrintLowercase {
    public static void main(String[] args) {
        for (int code = 97; code <= 122; code++) {
            System.out.print((char) code + " ");
        }
        System.out.println();
    }
}
Output
a b c d e f g h i j k l m n o p q r s t u v w x y z

3. Print Alphabets in Reverse Using a while Loop

Counting down with ch-- prints the letters from Z to A. The second loop prints uppercase and lowercase pairs side by side using Character.toLowerCase().

PrintAlphabetsReverse.java 
public class PrintAlphabetsReverse {
    public static void main(String[] args) {
        char ch = 'Z';
        while (ch >= 'A') {
            System.out.print(ch + " ");
            ch--;
        }
        System.out.println();

        for (char c = 'A'; c <= 'F'; c++) {
            System.out.print(c + "" + Character.toLowerCase(c) + " ");
        }
        System.out.println();
    }
}
Output
Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
Aa Bb Cc Dd Ee Ff

4. Summary

  • Characters have numeric codes, so a for loop can step from 'A' to 'Z' with ch++.
  • Casting the numbers 65–90 or 97–122 to char prints the uppercase or lowercase letters.
  • Count down with ch-- to print the alphabet in reverse.
  • Character.toLowerCase() and toUpperCase() convert between cases.

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