how do you create an array inside an object? (java)

Question

I'm working with aggregation and inheritance and I can't seem to figure out how to have separate arrays for separate objects. With this example, how would I make it so each club has it's own array of people so that I can print out a list of clubs and the members which belong to each.

public class Application{ 
    public static Club[] clubArray = new Club[10];

    //prompt user for club name
    clubArray[x++] = new Club(name);

    //prompt user for person name
    Person newPerson = new Person(name);
    clubArray[x-1].addPerson(newPerson);
    personCount++;

}

public class Club{
    public Person[] personArray = new Person[100];

    //addPerson method
    public void addPerson(Person newPerson){
            personArray[x] = newPerson;
        }
    }
}

related by same user http://stackoverflow.com/questions/23432881/printing-out-objects-within-objects-stored-in-different-arrays-using-tostring-j — DoubleDouble, May 02 '14 at 17:44
The code to which this question is about seems fine, but the rest seems to have parts missing. Variables `x` and `i` are never declared for example and you never seen to use the personArray — Richard Tingle, May 02 '14 at 17:46
The problem likely lies somewhere else in your code. What you have here should result in each `Club` instance having its own `personArray` instance. — Mike B, May 02 '14 at 17:46
Are you receiving some type of error message or just not seeing what is expected? — DoubleDouble, May 02 '14 at 17:48

score 0 · Answer 1 · edited May 23 '17 at 12:20

You can't place raw code like you had it, you need to put it in a method (or a static block) -

public static Club[] clubArray = new Club[10];
public static int x = 0; // <-- init to 0.

// You need a method... let's call it addClub.
public static void addClub(String name, String personName) {
  if (x >= clubArray.length) {
    // Array is full.
    return;
  }
  clubArray[x] = new Club(name); // <-- pass in the club name.

  Person newPerson = new Person(personName); // <-- pass in the person name
  clubArray[x].addPerson(newPerson);
  personCount++; // <-- Not sure where you want this....
  x++;
}

how do you create an array inside an object? (java)

1 Answers1