Java – update ArrayList with HashMap

I just started learning to use HashMap and read the java tutorial, but I was in trouble

I'm trying to update the list in HashMap, but I want to get the list of the key. Is there a way to update the specific list of the key without making... 5 different lists and updating them?

HashMap<String,ArrayList<String>> mMap = new HashMap<String,ArrayList<String>>();
        ArrayList<String> list = new ArrayList<String>();
        mMap.put("A",list);
        mMap.put("B",list);
        mMap.put("C",list);
        mMap.put("D",list);

        Iterator iter = mMap.entrySet().iterator();

        if (mMap.containsKey("A"))
        {   
            Map.Entry mEntry = (Map.Entry) iter.next();
            list.add("test");
            mMap.put("A",list);
            System.out.println(mEntry.getKey() + " : " + mEntry.getValue());
        }
        else if (mMap.containsKey("B"))
        {   
            Map.Entry mEntry = (Map.Entry) iter.next();
            list.add("entry");
            mMap.put("B",list);
            System.out.println(mEntry.getKey() + " : " + mEntry.getValue());
        }

Solution

You can use something similar:

mMap.get("A").add("test");
mMap.get("B").add("entry");