Auto complete in java

I have the following java code

import java.util.List;

public class Test(){
   public Test(){
      List list = new A
   }
}

when i try to complete the sentence, i do M-/ to complete, but nothing happens.
I want that emacs shows the constructors that corresponds to List (ArrayList,
etc). Just like eclipse does when we do C-Space.

How can i do this?

Thanks,
Pedro