XXXXX() is undefined. Must explicitly invoke another constructor如何解决
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当父类已经有了一个或多个显示的构造函数
public class Fu {Fu(String name){}}而你子类想写个默认构造函数时：
<pre name="code" class="java">public class Zi extends Fu {Zi(){}}会报出错误，你仅需要在子类无参构造中：
Zi(){ super(null);} 0 0
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