Can I add a group of ArrayList into a single ArrayList?

I hope I understand your question correctly An ArrayList is a list of Object types. If you wish to add an ArrayList as the item in your ArrayList, then you can do this An example ArrayList list = new ArrayList(); ArrayList list2 = new ArrayList(); ArrayList list3 = new ArrayList(); list. Add(list2); list.

Add(list3) This will result in your first ArrayList (list) containing two arraylists in position 0 and 1 If however you are looking to add the contents of several ArrayLists to a single list of elements, then you use addAll on the ArrayList. Such as ArrayList consolidatedList = new ArrayList(); list. AddAll(list2); list.

AddAll(list3).

I hope I understand your question correctly. An ArrayList is a list of Object types. If you wish to add an ArrayList as the item in your ArrayList, then you can do this.An example ArrayList list = new ArrayList(); ArrayList list2 = new ArrayList(); ArrayList list3 = new ArrayList(); list.

Add(list2); list. Add(list3); This will result in your first ArrayList (list) containing two arraylists in position 0 and 1. If however you are looking to add the contents of several ArrayLists to a single list of elements, then you use addAll on the ArrayList.

Such as ArrayList consolidatedList = new ArrayList(); list. AddAll(list2); list. AddAll(list3).

I didn't actually get what you want to do. Do you want to add all elements from different ArrayLists to one resulting ArrayList? If so, use ArrayList#addAll(Collection collection) method.

If you want an ArrayList of ArrayLists, use ArrayList#add(Object o) method. You can also parameterize your resulting ArrayList like this: List res = new ArrayList().

Yes you can add a "group of ArrayLists" into a single array list. If you want to "recognize" your ArrayLists, I would recommend using a Map, a HashMap for example. Please also think about accepting answers to your other questions, and post code in your questions, you will get better help and people will hate you less.

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