java 为什么显式类型参数应该用菱形代替?
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Why explicit type argument should be replaced by diamond?
提问by Dan Chaltiel
I'm using Android Studio and I write this :
我正在使用 Android Studio,我写了这个:
List<Button> buttons = new ArrayList<Button>();
I have this message :
我有这个消息:
Explicit type argument Button should be replaced by <>
显式类型参数 Button 应替换为 <>
I'm curious, why would it be better to use diamond instead ?
我很好奇,为什么用钻石代替会更好?
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 !
编辑:
我根本不同意重复!我之前看到过那个答案,它将显式参数与根本没有参数进行比较,而我将显式参数与隐式参数进行比较!
回答by Sleiman Jneidi
It is less verbose, consider the following
它不那么冗长,请考虑以下内容
Map<String,List<String>> map = new HashMap<String,List<String>>();
vs
对比
Map<String,List<String>> map = new HashMap<>();
I think you would go for the second option
我想你会选择第二个选项