reference:http://blog.csdn.net/qq_33642117/article/details/51909346
当类中没有定义构造函数时，系统会指定给该类加上一个空参数的构造函数。这个是类中默认的构造函数。当类中如果自定义了构造函数，这时默认的构造函数就没有了.so,我们要构造一个空的构造函数，函数名要与类名一样。
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