Create Password Rule - Valid / Invalid

Make a password rule, and take input of the password from the user and compare the password with your rule, if the user had entered valid password then print the message, password valid, else the password is invalid for (the whatever) reason.

Rules:-
-Length 8-12
-Should have one numeric character
-No Special Character
-Atleast one UPPERCASE letter

PHP Code:

import java.util.*;
import java.lang.String;
import java.lang.Character;
public class PasswordSpence {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Please enter a Password: ");
String password = input.next();
if (isValid(password)) {

[Code] ....