单项选择题

关于构造方法的描述，哪一个是正确的( )

A．如果程序中没有任何构造方法，则会默认增加一个无参的构造方法。
B．如果程序中没有任何构造方法，则会默认增加一个有参的构造方法。
C．如果程序中存在构造方法，则会默认增加一个无参的构造方法。
D．如果程序中存在构造方法，则会默认增加一个有参的构造方法。

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