The question mark at the end of the method name means that the method is testing for something and will return True or False.
方法名末尾的问号意思是该方法在测试某些东西，并且将返回True或False。
Simply override each abstract method in BridgeFactory, and change it to return true or false, as appropriate.
只需覆盖BridgeFactory中的每个抽象方法，并适当地将它改为返回true或false。
This method returns true if the file or directory is successfully deleted. Otherwise it returns false.
若文件或目录被成功删除，此方法将返回true，否则返回false。
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