What functionality to make for the application?

Question

Java

I'm preparing for the exam and getting my hands on it, writing an RSS aggregator, tell me what functionality to implement to cover topics:
1) Serialization and deserialization
2) Working with JSON and XML
3) Working with data streams
4) LINQ

Answer 1

1) Serialization and deserialization
2) Working with JSON and XML
You can cover both at the same time if you make a configuration file and save settings to it.
3) Working with data streams
You can hardly do without it, you will probably need FileStream and NetworkStream to get the feed and save to disk.
4) LINQ
Similarly, if you know what it is, you will use it wherever it is convenient, in any application of more than 30 lines of code there are foreachs that can be replaced by using LINQ.