问题
单项选择题
(43)设计模式允许一个对象在其内部状态改变时改变它的行为。下图为这种设计模式的类图，已知类State 为抽象类，则类(44)的实例代表了 Context 对象的状态。
（43）处填（）。
A．单件(Singleton)
B．桥接(Bridge)
C．组合(Composite)
D．状态(State)
答案
参考答案：D
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(43)设计模式允许一个对象在其内部状态改变时改变它的行为。下图为这种设计模式的类图，已知类State 为抽象类，则类(44)的实例代表了 Context 对象的状态。
（43）处填（）。
A．单件(Singleton)
B．桥接(Bridge)
C．组合(Composite)
D．状态(State)
参考答案：D
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