Checking Password Rule Using Wrapper Class

I have to use wrapper class for this assignment. I need to know if my code is more like object oriented or not and am I using the wrapper class properly here? Let me know if I can make this code better.

I also need to know if I can mask this password input (STRING) using NetBeans/Eclipse IDE?

Password rule is as followed : Length of Password 8-12, with no special characters, including minimum one uppercase letter, and only one numeric value.

Here is the code :

import java.util.Scanner;
public class Assignment1
{
private static String password=null;
private static void password_input() {
Scanner input = new Scanner(System.in);
password = input.nextLine();

[Code] .....