KeyCreator.java

import java.util.Random;
import java.util.ArrayList;

public class KeyCreator {

    // Define the variables

    private Random random = new Random();
    private int passwordLength;
    private String password;
    private ArrayList<Character> characters = new ArrayList<Character>();

    public KeyCreator(int length) {
        // Initialize the variable
        this.passwordLength = length;
        this.random = new Random();
        this.password = "";
        this.characters = new ArrayList<Character>();
    }

    public String createPassword() {
        // write code that returns a randomized password
        int i = 0;
        this.password = "";
        
        while (i < this.passwordLength) {
            int index = random.nextInt(25);
            char symbol = "abcdefghijklmnopqrstuvwxyz".charAt(index);
            this.characters.add(symbol);
            i++;
        }
        
        for (Character letter : this.characters) {
            this.password += letter;
        }
        
        this.characters.clear();
        return this.password;
    }
}

Program.java

public class Program {
    public static void main(String[] args) {
        PasswordRandomizer randomizer = new KeyCreator(13);
        System.out.println("Password: " + randomizer.createPassword());
        System.out.println("Password: " + randomizer.createPassword());
        System.out.println("Password: " + randomizer.createPassword());
        System.out.println("Password: " + randomizer.createPassword());
    }
}