This approach also enables the enhanced for loop to walk through the children.
这种方法还使得for循环可以遍历所有孩子。
To summarize: use the enhanced for loop by default, but consider a hand-written counted loop for performance-critical ArrayList iteration.
结论：优先采用改进for循环，但在性能要求苛刻的ArrayList迭代中，考虑采用手写计数循环。
The enhanced for loop (also sometimes known as "for-each" loop) can be used for collections that implement the Iterable interface and for arrays.
改进for循环(有时被称为“for - each”循环)能够用于实现了iterable接口的集合类及数组中。
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