is there any way to insert duplicate key in HashMap?

I have data which contain duplicates keys. How can i achieve this with HashMap?. is there any way?

Either use Map<String,List<Object>> where the key refers to a List of values or Google Guava (I read in this thread)

Neeraj Dhiman wrote:I have data which contain duplicates keys. How can i achieve this with HashMap?. is there any way?

you can add duplicates keys but , already present value of the same key will be changed and the new value will be updated there self.

And welcome to the Ranch

, somesh kanti

Campbell Ritchie wrote:And welcome to the Ranch , somesh kanti

Thank you Ritchie

You can use multimap instead of that one.

http://www.sgi.com/tech/stl/Multimap.html

this is the link where you can find the details about multimap.

John Jai wrote:Either use Map<String,List<Object>> where the key refers to a List of values or Google Guava (I read in this thread)

good comment from the thread you directed us to, use a map<String,Set<object>> to remove real duplicates

Yes Wendy... you are right.

somesh kanti wrote:You can use multimap instead of that one.

http://www.sgi.com/tech/stl/Multimap.html

this is the link where you can find the details about multimap.

Although you're right in using a multimap (Google Guava has an implementation), are you aware that the page you linked to is about the C++ STL multimap?

Thanks you All. Problem Solved using Map<String,List<Object>>.