Java, Collection constructor

Question

is there any difference between :

TreeMap myMap = new TreeMap<>();

and

TreeMap

        

Answer 1

They are the same in java 7 where the diamond operator <> was introduced. In older versions of java the diamond operator will not work.

The diamond operator brings type inference to constructors. Type inference on generic methods is available in java 5 and higher. Prior to java 7, to create a generic class using the compiler's type inference you had to use generic factory methods like static Map createMap().