Java For-Each循环:排序顺序 [英] Java For-Each Loop : Sort order

问题描述

java for-each循环是否保证如果在列表上调用这些元素，它们将按顺序显示?在我的测试中确实如此，但是我似乎找不到任何文档中明确提及的内容

Does a java for-each loop guarantee that the elements will be presented in order if invoked on a list? In my tests it does seem to, but I can't seem to find this explicitly mentioned in any documentation

List<Integer> myList;// [1,2,3,4]
for (Integer i : myList) {
  System.out.println(i.intValue());
}

#output
1,2,3,4

推荐答案

是. foreach循环将按iterator()方法提供的顺序遍历列表.请参见关于Iterable接口的文档.

Yes. The foreach loop will iterate through the list in the order provided by the iterator() method. See the documentation for the Iterable interface.

如果您查看列表Javadoc 您会看到列表是一个有序集合"，并且iterator()方法返回一个按正确顺序"进行迭代的迭代器.

If you look at the Javadoc for List you can see that a list is an "ordered collection" and that the iterator() method returns an iterator that iterates "in proper sequence".

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