Lesson 36: Simple Password Generator using Java™

This is my own creation, I've been wondering and curious about what it's like to create your own random password generator, so I spent some time researching about it

import java.util.Random;
import java.util.Scanner;

public class PasswordGenerator{

    public static void main(String args[]){

    // Initiate a new Scanner
    Scanner userInputScanner = new Scanner(System.in);
    System.out.print("How many password combination do you want? ");
    int numberOfPass = userInputScanner.nextInt();
    Random rand = new Random();

    String charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    StringBuilder pass = new StringBuilder();

    while(numberOfPass > 0){
//8-character length, first char upper case
pass.append(charset.charAt(rand.nextInt(charset.indexOf("Z")+1)));

for(int i=1;i<8;i++){
int index =
        rand.nextInt ( charset.length() - charset.indexOf("a") ) + charset.indexOf("a");
pass.append(charset.charAt(index));
}

System.out.println(pass.toString());
pass.setLength(0);
numberOfPass--;
    }
    }
}

The result would be something like this: