java - How to access String within an ArrayList within an ArrayList within a HashMap? -

so have arraylist full of strings

arraylist<string> colours = new arraylist<>();     colours.add("red");     colours.add("blue"); 

and arraylist stored in arraylist

arraylist<arraylist> container = new arraylist<>();     container.add(colors); 

and arraylist stored in hashmap

hashmap<integer, arraylist> map = new hashmap<>();     map.put(1, container); 

how access "red"? tried

system.out.println(map.get(1).get(0).get(0)); 

but gave a

error: java: cannot find symbol   symbol:   method get(int)   location: class java.lang.object 

you should not use raw types arraylist<arraylist> use "cooked" types such arraylist<arraylist<string>> (or better, list<list<string>>).

likewise, instead of hashmap<integer, arraylist>, use hashmap<integer, arraylist<arraylist<string>>> (or better, map<integer, list<list<string>>>).

if make these changes, map.get(1).get(0).get(0) expression compile correctly.