Lists.newArrayList vs new ArrayList [英] Lists.newArrayList vs new ArrayList

问题描述

创建字符串 List 的最佳构造是什么？它是 Lists.newArrayList（）（来自guava）或 new ArrayList（）？

What is the best construction for creating a List of Strings? Is it Lists.newArrayList() (from guava) or new ArrayList()?

只是个人偏好吗？

或者只是输入泛型类型推断？

或者在使用列表时是否有任何理论或实用价值？ newArrayList（）？

is it just a personal preference?
or is it just Type generic type inference?
or is there any theoretical or practical value in using Lists.newArrayList()?

推荐答案

guava生成器可以多次保存输入类型参数。比较：

The guava builder saves typing the type arguments multiple times. Compare:

List<Foo<Bar, Baz>> list = Lists.newArrayList();
List<Foo<Bar, Baz>> list = new ArrayList<Foo<Bar, Baz>>();

在Java 7中，它已经过时了，因为你有钻石操作符：

In Java 7 it's a bit obsolete though, because you have the diamond operator:

List<Foo<Bar, Baz>> list = new ArrayList<>();

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