java – HashMap更新ArrayList

我正在尝试更新HashMap中的List,但是我想获取该密钥的List,是否有办法更新密钥的特定List而不必制作… 5个不同的列表并更新它们？

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());
        }