14
任务
Java Collections, 第 1 级, 课程 8
Null object pattern
Read about the null-object pattern on Wikipedia.
Use Files to correctly initialize the fileData field with a ConcreteFileData object in the Solution class's constructor.
If you have any problems reading the file in the pathToFile path, then initialize the field with a NullFileData object.
7
任务
Java Collections, 第 1 级, 课程 8
Path 101
Read about all of the Path class's methods.
Find one that creates a relative path between the current path and a passed path.
Implement the getDiffBetweenTwoPaths method. It must return a relative path.
The main method is not tested.