public static boolean hasUpperCase(String str) throws PasswordUpperCase
{
    boolean hasUpperCase = false;

    //checks the password for an upper case letter
    for (char c : str.toCharArray())
    {
        if(Character.isUpperCase(c))
        {
            hasUpperCase = true;
        }
    }

    if (!hasUpperCase)
    {
        throw new PasswordUpperCase();
    }
}

/*************OR************/

public static boolean hasUpperCase(String str) throws PasswordUpperCase
{
    boolean hasUpperCase = false;

    //checks the password for an upper case letter
    for (int c = 0; c < str.length() && !hasUpperCase; c++)
    {
        if(Character.isUpperCase(c))
        {
            hasUpperCase = true;
        }
    }

    if (!hasUpperCase)
    {
        throw new PasswordUpperCase();
    }
}