//specify type variables for the class
//F is the type of the fist item
//S is the type of the second
public class Association<F, S> {
	private F first;
	private S second;
	
	public Association(F item1, S item2){
		first = item1;
		second = item2;
		
		//can't do this
		//F other = new F();
		//can't cast something to F or S
		//F item = (F)someObject
		//F[] data = new F[10];
		//variable instanceof F
		//boolean b2 = item1 instanceof S;
		//can do this, but won't
		//boolean b = item1 instanceof Integer;
	}
	
	public F getFirst(){
		return first;
	}
	
	public S getSecond(){
		return second;
	}
	
	public void setFirst(F item){
		first = item;
	}
	
	public void setSecond(S item){
		second = item;
	}
	
	//use a wildcard for the type ?
	public boolean equals(Association<? extends F, ? extends S> a){
		System.out.println("Equals called");
		return first.equals(a.getFirst()) && second.equals(a.getSecond());
	}
}