Java Programs - Solved 2018 ICSE Computer Science Paper

import java.io.*;
class Menu{
    public static void main(String args[])
    throws IOException{
        InputStreamReader in = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(in);
        System.out.println("1. Pattern 1");
        System.out.println("2. Pattern 2");
        System.out.print("Enter your choice: ");
        int choice = Integer.parseInt(br.readLine());
        switch(choice){
            case 1:
            String s = "ABCDE";
            for(int i = s.length(); i >= 0; i--)
                System.out.println(s.substring(0, i));
            break;
            case 2:
            s = "BLUE";
            for(int i = 0; i < s.length(); i++){
                char ch = s.charAt(i);
                for(int j = 0; j <= i; j++)
                    System.out.print(ch);
                System.out.println();
            }
            break;
            default:
            System.out.println("Invalid choice!");
        }
    }
}  

import java.util.Scanner;
class Pattern{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("1. ABCDE");
        System.out.println("2. BLUE");
        System.out.print("Enter your choice: ");
        int choice = Integer.parseInt(in.nextLine());
        switch(choice){
        case 1:
            for(char i = 'E'; i >= 'A'; i--){
                for(char j = 'A'; j <= i; j++)
                    System.out.print(j);
                System.out.println();
            }
            break;
        case 2:
            String s = "BLUE";
            for(int i = 0; i < s.length(); i++){
                for(int j = 0; j <= i; j++)
                    System.out.print(s.charAt(i));
                System.out.println();
            }
            break;
        default:
            System.out.println("Invalid choice!");
        }
    }
}