reference:http://blog.csdn.net/qq_33642117/article/details/51909346
當類中沒有定義構造函數時，系統會指定給該類加上一個空參數的構造函數。這個是類中默認的構造函數。當類中如果自定義了構造函數，這時默認的構造函數就沒有了.so,我們要構造一個空的構造函數，函數名要與類名一樣。
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