I map from lists of lists in java, where in elements of first list will be keys of map and rest other lists will be values to those : Suppose this list example `[[a,b,c],[1, ,3],[12,34, ]]` is list of lists.
Trying to  convert this into map where in map would be like this.

    a=1,12
    b=null,34
    c=3,null

Please note i have already created above list of list from string of below type 
NOTE:Learning java
> a:b:c|1::3|12:34:|

Approach here was to convert this string first to list of lists and then make the first list elements as keys and rest other as values to this keys. 
if someone can please help me on this?