java - Have complication with ArrayList of ArrayList -

i implementing algorithm,for need use arraylist of arraylist.i want retrieve each arraylist main arraylist.

eg: if main arraylist contains 5 arraylist , each arraylist in main list contains 5 rows.

mainarraylist:

[1,2,3,4,5,a , 2,3,4,5,3,b , 7,8,9,4,5,d]    //1st arraylist [1,2,3,4,5,e , 2,3,4,5,3,n , 7,8,9,4,5,e]    //11nd arraylist [1,2,3,4,5,f , 2,3,4,5,3,t , 7,8,9,4,5,q]    //111rd arraylist [1,2,3,4,5,c , 2,3,4,5,3,b , 7,8,9,4,5,a]    //1vth arraylist [1,2,3,4,5,r , 2,3,4,5,3,m , 7,8,9,4,5,z]    //v th arraylist 

i need access each arraylist main list , print it's content row row i.e example print 1st arraylist main list.

1,2,3,4,5,a  2,3,4,5,3,b  7,8,9,4,5,d 

similarly need print arraylist in main list same above.

you can using arraylist

list<list<object>> twodimarray = new arraylist<arraylist<>>(); twodimarray.add(arrays.aslist("1","2","3"); for(list<object> list: twodimarray){    for(object o : list){        system.out.println(o.tostring());    } } 

and of course using hashmap:

map<string,list<object>> map = new hashmap<string,list<object>>(); (map.entry<string, string> entry : map.entryset()) {    system.out.println(entry.getkey() + "/" + entry.getvalue()); }