Question

I have an hash map, which maps integers to array of ArrayLists. For example, my data structure is the following:

7->((7,5,**4,3,1**),(7,6,4,3,1))
4->((4,2,1),(4,3,1))

Here, 7 is key, and arraylist e.g is (7,5,4,3,1), the array of arraylist in turn is ((7,5,4,3,1),(7,6,4,3,1))

4 is key, and arraylist e.g. is (4,2,1), the array of arraylist in turn is ((4,2,1),(4,3,1))

I wish to substitute the key values (in any given arraylist) and the values following it to create other arraylists, one example of this is given below:

7->((7,5,**4,2,1**),(7,6,4,2,1),(7,5,4,3,1),(7,6,4,3,1))

the thing I am not getting is how to obtain this substitution….to create bigger arraylists

the thing I am not getting is how to obtain this substitution….to create bigger arraylists..i know the datastructure..but want to create arraylists by substitution as given in subsequent example

Is there someway in java programming by which I may achieve this?
I am a novice at Java programming…I thought long about this but could not move it…can someone please help

Answer 1

HashMap<Integer,ArrayList<ArrayList<Integer>>> map;
map = new HashMap<Integer,ArrayList<ArrayList<Integer>>>();

EDIT: I’ve used 2 lines so that my answer could be more readable.