Solved Question on maps and collections

What's the difference between

Code:

HashSet<Object> obj = new HashSet<>();

// and

HashSet<Object> obj = new HashSet();

Rather than this

Code:

HashSet<Object> obj = new HashSet<Object>();

(This question applies for maps and all kinds of collections)

 

@kameronn
While there is no real difference between

Code:java

HashSet<Object> obj = new HashSet<>();

and

Code:java

HashSet<Object> obj = new HashSet<Object>();

(besides the fact that one is shorter to type), as the Diamond operator (<>) automatically figures out the arguments from the left side. This, however,

Code:java

HashSet<Object> obj = new HashSet();

should never be used, as it is only a backwards-compatibility thing (Most IDE's will even give you a warning if you try to do this), and disables the inspection in your IDE to be able to do certain things, like if you do it this way, you can pass a List of Strings into the constructor of an ArrayList, even though you defined it on the left side to be of type Integer. See this stackoverflow answer for more info.