Question

I have Map <A, List<A>> map = new HashMap<A, List<A>>();

Say I want to print out each element in List<A> via an enhanced for loop

doing map.get(KeyOftypeA) does not return an iterable list…seems it returns a generic Object what do I do to get back the nice list i input and make it iterable?…

EDIT: Here’s the full listing of the code I am trying to run

import java.util.*;



public class StuffTag {

    public static void main (String[]args){
        String stuff;
        List<String> tags = new ArrayList();
        Map<String,List<String>> stuff_tags = new HashMap<String,List<String>>();
        List<Map> list_stuff_tags = new ArrayList();

        stuff="David and Goliath";
        tags.add("fire");
        tags.add("water");
        tags.add("smoke");
        tags.add("paper");

        stuff_tags.put(stuff, tags);
        list_stuff_tags.add(stuff_tags);
        Map el =list_stuff_tags.get(0);
         for(String x:el.get("David and Goliath"))
             System.out.println(x);

    }

}

Answer 1

You need to define type of Map el e.g, Map<String,List<String>> el =list_stuff_tags.get(0);
this will work for you.