Passing objects to classes

Hi
I'm having a problem trying to create a class which contains a group of another class I have made. Basically I have a class called square, which looks like this

Code:

---

class Square
{
        int number;

        public Square()
        {
       
        }

        public void setNumber(int num)
        {
                if((num > 0) && (num <= 9))
                {
                        set.clear();
                        set.add(num);
                        number = num;
                }
                else
                {
                        System.out.println("You have entered an illegal number");
                }
        }

        public int getNumber()
        {
                return number;
        }
}

---

And I want to have another class which contains two squares. So something like this.

Code:

---

class pair
{
        public pair(Square s, Square s2)
        {

        }
}

---

However, I know this won't really do what I want it to do, as I need the Squares s and s2, to be updated when I update the original square in my main program. So if I did something like this in my main program:

Code:

---

Square b = new Square();
Square c = new Square();

pair p = new pair(b,c);

c.setNumber(7);

---

c in pair would update to 7 as well. Is there anyway of doing this? Thanks.

What happened when you tried exactly that? That should work just fine. If not, you should post an SSCCE demonstrating what you're actually doing.

Sorry, apologies I missed out the fact that I need to be able to interact with the variables in pair, using a get method or something similar to return the variables in it like:

Code:

---

class pair
{
        public pair(Square s, Square s2)
        {

        }
        public Square getSquare()
        {
              return s;
        }
}

---

However if I do this, it can't find variable s, which I understand why it can't, as it is local, but if I create a Square within the class to get the value, it won't update if I update the square in the main program

Then just keep track of the Square instances you pass in. Like this example:

Code:

---

public class Cat{
  String myName;
  public Cat(String name){
      myName = name;
  }
  public String getName(){
      return myName;
  }
}

---