Iterative Constructs in Java

import java.util.Scanner;
 
public class ICSPatterns
{
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
 
        System.out.println("Enter 1 for Pattern 1");
        System.out.println("Enter 2 for Pattern 2");
        System.out.print("Enter your choice: ");
        int choice = sc.nextInt();
 
        String str = "ICSE";
        int len = str.length();
 
        switch (choice) {
            case 1:
                for (int i = 0; i < len; i++) {
                    for (int j = 0; j < i; j++) {
                        System.out.print(" ");
                    }
                    System.out.println(str.charAt(i));
                }
                break;
 
            case 2:
                for (int i = len - 1; i >= 0; i--) {
                    for (int j = 0; j < i; j++) {
                        System.out.print(" ");
                    }
                    System.out.println(str.charAt(len - 1 - i));
                }
                break;
 
            default:
            System.out.println("Incorrect choice");
            break;
 
        }
    }
}