The getOrder method takes the order ID as a parameter, gets the corresponding order from the HashMap, and returns the same.

getOrder 方法接受订单 ID 作为参数，从 HashMap 获得对应的订单并返回订单。

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If this collection makes any guarantees as to what order its elements are returned by its iterator, this method must return the elements in the same order.

如果集合保证它所含元素的顺序为迭代器的顺序，那么方法必须以相同顺序返回元素。

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The following example makes the same method calls as the preceding example, but the order of the calls is reversed.

下面的示例与上面的示例调用相同的方法，但是调用的顺序完全相反。

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