Iterative Constructs in Java

import java.util.Scanner;
 
class AlphabetPatterns {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        System.out.println("MENU");
        System.out.println("1. Pattern 1");
        System.out.println("2. Pattern 2");
        System.out.print("Enter your choice: ");
        int choice = sc.nextInt();
 
        switch (choice) {
            case 1:
                // Pattern 1
                for (int i = 5; i >= 1; i--) {
                    for (int j = 0; j < i; j++) {
                        System.out.print((char)('A' + j));
                    }
                    System.out.println();
                }
                break;
 
            case 2:
                // Pattern 2
                char[] letters = {'B', 'L', 'U', 'E'};
                for (int i = 0; i < letters.length; i++) {
                    for (int j = 0; j <= i; j++) {
                        System.out.print(letters[i]);
                    }
                    System.out.println();
                }
                break;
 
            default:
                System.out.println("Invalid choice! Please enter 1 or 2.");
        }
 
        sc.close();
    }
}