Why explicit type argument should be replaced by diamond? [duplicate]

问题

This question already has answers here:

What is the point of the diamond operator (<>) in Java 7? (7 answers)

Closed 4 years ago.

I'm using Android Studio and I write this :

List<Button> buttons = new ArrayList<Button>();

I have this message :

Explicit type argument Button should be replaced by <>

I'm curious, why would it be better to use diamond instead ?

List<Button> buttons = new ArrayList<>();

EDIT :
I don't agree with the duplicate at all ! I saw that answer before and it compares explicit argument to no argument at all, whereas I compare explicit argument to implicit argument !

回答1:

It is less verbose, consider the following

Map<String,List<String>> map = new HashMap<String,List<String>>();

vs

Map<String,List<String>> map = new HashMap<>();

I think you would go for the second option

来源：https://stackoverflow.com/questions/33137417/why-explicit-type-argument-should-be-replaced-by-diamond