Example: Association between Item and Bid classes.
Bid contains a reference to Item.

			

			public class Item {
			

			Integer itemId;
			

			String name;
			

			}
			

		

Approach 1:

			

			public class Bid {
			

			Integer bidId;
			

			Item item;
			

			ETC
			

			}
			

		

Approach 2:

			

			public class Bid {
			

			Integer bidId;
			

			Integer itemId;
			

			ETC
			

			}
			

		

I just would like to see the pros and cons of these two approaches.

Thank you guys