Java Map implementation that returns a default value instead of null

Question

I have a Map> in my code, where I\'d avoid potential null pointers if the map\'s #get() method returned an empty l

Answer 1

Similar to previous posts except you can just override the get method if you want to change its behaviour.

Map> map = new LinkedHashMap>() {
    public String get(Object key) {
        List list = super.get(key);
        if (list == null && key instanceof String)
           super.put(key, list = new ArrayList());
        return list;
    }
};