Object Instantiation and Initialization

Which of the following is a correct replacement for /* code to get birthDate */?

Consider the following class:

public class Date
{
    private int day;
    private int month;
    private int year;
    public Date()
    {
        ...
    }
    // default constructor
    public Date(int mo, int da, int yr)
    {
        ...
    }
    public int month() // returns month of Date
    {
        ...
    }
    public int day() // returns day of Date
    {
        ...
    }
    public int year() // returns year of Date
    {
        ...
    }
    // Returns String representation of Date as "m/d/y", e.g., 4/18/1985.
    public String toString()
    {
        ...
    }
}

Here is a client program that uses Date objects:

public class BirthdayStuff
{
    public static Date findBirthdate()
    {
        /* code to get birthDate */
        return birthDate;
    }

    public static void main(String[] args)
    {
        Date d = findBirthdate();
        ...
    }
}

Which of the following is a correct replacement for /* code to get birthDate */?

I.

System.out.println("Enter birthdate: mo, day, yr: ");
int m = ...;
int d = ...;
int y = ...;
Date birthDate = new Date(m, d, y);

II.

System.out.println("Enter birthdate: mo, day, yr: ");
// read user input
// read user input
// read user input
int birthDate.month() = ...;
int birthDate.day() = ...;
int birthDate.year() = ...;
Date birthDate = new Date(birthDate.month(), birthDate.day(), birthDate.year());

III.

System.out.println("Enter birthdate: mo, day, yr: ");
// read user input
// read user input
// read user input
int birthDate.month = ...;
int birthDate.day = ...;
int birthDate.year = ...;
Date birthDate = new Date(birthDate.month, birthDate.day, birthDate.year);