Eclipse Warning with Java HashMap -

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Eclipse is saying "Hashmap is a raw type" when I use the following code 

  hashmap = new hashmap ();

Any thoughts can be wrong?

will accept

edit: actually, when you go to Java here I will also give an example:

Say that I want to map somebody's name to their person object: 

  map & lt ; String, person & gt; Map = new hashmap & lt; String, person & gt; (); // map.get method now comes back to a person // map.put method now requires a string and a person

is checked in these compiled time;

How Java generates this type of information is lost on run-time.

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