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。

youdao

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。

youdao

The is validated predicate returns true if the XML document is already validated against any specific schema or against any registered schemas, else it will return false.

如果已经根据特定的模式或任何已注册模式验证了XML文档，IS VALIDATED谓词将返回true，否则返回false。

youdao

Now, less than is just, if you haven't used it before, it's just the operator you'd expect, it's comparing two things and it's going to return either true or false depending on whether the first argument is false less than the second argument.

现在，小于这个符号是，如果你之前没用过它的话，它就是你期望的那个运算符，它会比较两个独享,然后基于第一个参数是不是,小于第二个参数,返回true或者。

麻省理工公开课 - 计算机科学及编程导论课程节选