The element choice allows only one of its children to appear in an instance.
元素choice只允许它的一个子女出现在实例中。
You can store a collection of orders in an instance variable for the appropriate customer.
您可以在适当客户的实例变量中存储订单集合。
Constructor call is valid only as the first statement in an instance constructor.
构造函数调用仅作为实例构造函数中的第一条语句有效。
Constructor call is valid only as the first statement in an instance constructor.
构造函数调用仅作为实例构造函数中的第一条语句有效。
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