Converting Map<String,String> to Map<String,Object>
dictionary, hashmap, java, optimization, string
Solution
Instead of writing your own loop that calls `put`, you can `putAll`, which does the same thing:
filterMapObj.putAll(filterMap);
(See the Javadoc.)
And as Asanka Siriwardena points out in his/her answer, if your plan is to populate `filterMapObj` immediately after creating it, then you can use the constructor that does that automatically:
filterMapObj = new HashMap<>(filterMap);
But to be clear, the above are more-or-less equivalent to iterating over the map's elements: it will make your code cleaner, but if your reason for not wanting to iterate over the elements is actually a performance concern (e.g., if your map is enormous), then it's not likely to help you. Another possibility is to write:
filterMapObj = Collections.<String, Object>unmodifiableMap(filterMap);
which creates an unmodifiable "view" of `filterMap`. That's more restrictive, of course, in that it won't let you modify `filterMapObj` and `filterMap` independently. (`filterMapObj` can't be modified, and any modifications to `filterMap` will affect `filterMapObj` as well.)
Problem
I have Two Maps ``` Map<String, String> filterMap Map<String, Object> filterMapObj ``` What I need is I would like to convert that `Map<String, String>` to `Map<String, Object>`. Here I am using the code ``` if (filterMap != null) { for (Entry<String, String> entry : filterMap.entrySet()) { String key = entry.getKey(); String value = entry.getValue(); Object objectVal = (Object)value; filterMapObj.put(key, objectVal); } } ``` It works fine, Is there any other ways by which I can do this without iterating through all the entries in the Map.