构造器会把该实例变量(即信用限制)设为一个参数。

The constructor will set the credit limit instance variable to be equal to that specified as a parameter.

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这意味着，如果一个变量被声明为接口类型，其值可参考，即实例化任何实现接口的类的任何对象。

This means that if a variable is declared to be the type of an interface, its value can reference any object that is instantiated from any class that implements the interface.

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