DR Challenge #4 Easy

package challenges;

import java.util.Scanner;

class Four {
    Integer mult;
    Integer length;

    public static void main(String[] args) {
        Four scramble = new Four();
        scramble.prompt();
        scramble.generate();
    }

    public void prompt() {
        System.out.println("How many passwords would you like to generate?");
        Scanner user_input = new Scanner(System.in);
        mult = user_input.nextInt();

        System.out.println("How many characters per password?");
        length = user_input.nextInt();
        user_input.close();
    }

    public void generate() {
        char[] alphabet = {'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'};
        StringBuilder encrypted = new StringBuilder();
        int j = 0;
        while (j < mult) {
            for (int i = 0; i < length; i++) {
                encrypted.append(alphabet[(int)(Math.random()*26)]);
                //System.out.println(encrypted);
                //System.out.println(alphabet[(int)(Math.random()*26)]);
            }
            System.out.println(encrypted);
            encrypted.delete(0, encrypted.length()-1);
            j++;
        }
    }
}