Java OOP - Learning instance of element of Array, for simulating human life ... Mating and new Borning

Question

as you can see, probably I exaggerated this topic. Here is the what i need;

I have a 5-6 classes. and i simulating , when this classes meeting on same location, if they same class with opposite gender, they will be mate. and a baby will born with same class.

But i confused here. I am matching classes with ArrayList and for loop (i and j nested loop).

that's what i need ;

if(male Xclass   matches   female Xclass){   //actually here i dont know classes
  Xclass x = new Xclass();                   // i have just elements i and j
  list.add(x);
} // something like that , but how can i know which class they have and how 
  // can i create a new class while i don't know this.

**Sorry for bad english, Thank you :)

EDIT: I meant same class with different gender; there are classes A,B,C,D and gender is just variable (private int Gender; //1 for male,0for female and it is random value , 1 or 0) i have a also loctaion x,y class. male A and male A cant mate male A and female A can mate male B and female C cant mate i mean this. sorry for bad experession

Answer 1

So do you mean like this (it's disturbing)? It's weird what you mean by classes of the same type and then different. From your example you only have one class. If I understand correctly you want to model something like this.

class Person {

  public enum Gender {

     Male,
     Female;
  }

  public enum SocialClass {
    Royal,
    Peasant,
    Barbarian;
  }

  public final Gender gender;
  public final SocialClass socialClass;

  public Person(Gender gender, SocialClass socialClass) {
     this.gender = gender;
     this.socialClass = socialClass;
  }

  public Person meet(Person person) {
    if (person != this && person.socialClass == this.socialClass && person.gender != this.gender) {
       return new Person(Math.random() > .5 ? Gender.Male : Gender.Female, this.socialClass);
    } else {
       return null;
    }
  }
}

Then you could do something like:

List<Person> people = ...// however you got your list
Person person = randomRemoveFrom(people);
Person otherPerson = randomRemoveFrom(people);

Person child = person.meet(otherPerson);
if( child != null) {
   System.out.println("New Person instance?");
} else {
   System.out.println("No new person");
}