groovy - 在groovy中创建Arraylist和Hashmap有哪些不同的方法

Question

我创建了一个如下所示的 ArrayList:

def list = new ArrayList()

但是 codenarc 报告它发出如下警告。

ArrayList objects are better instantiated using the form "[] as ArrayList"

实例化集合的更好方法是什么？

Answer 1

你可以这样做:

def list = []               // Default is ArrayList
def list = [] as ArrayList
ArrayList list = []

再说一遍，对于HashMap:

HashMap map = [:]
def map = [:] as HashMap

本例中的默认值是 LinkedHashMap:

def map = [:]