What application to make?

Question

Java

Guys, since theory without practice is time wasted, I ask you for help, tell me what applications can be written on topics:
1) Performing input / output operations
2) Using JSON and XML data
3) Serializing and deserializing data
4) Storing data in collections and extracting data from collections
is desirable at a more complicated or intermediate level, so that you can fill your hand, and it would be cool to think carefully
if it was one big application that has it all, throw some ideas)

Answer 1

I can give you specific tasks for junior IO, Collections.
the link is also for juniors, I highly recommend epam courses in Ryazan, just now a set, if you want to learn something, it’s not a bad option (this is not an advertisement, it’s just that they helped me a lot at one time)

Answer 2

You can make a client for a social network. Better even just a messenger, for example, to VKontakte or facebook. Their API is well documented. The difficulty will not be childish, and you will encounter all sorts of tasks on which you can get your hands on it. Cache part of the data so that the offline client does not just crash with an error here and serialization appears.
Good luck!

Answer 3

You can try to make a distributed monitoring system. The idea is as follows, there are several machines from which you need to collect data (for example, the number of messages in log files) in a given period of time and send it over the network to a central server. To make it more interesting, add the requirement to work in an unstable connection. As a result, the client side must be able to save data locally and send the entire history when the central server becomes available.
- input / output - work with local files and data transfer over the network
- JSON, XML - this is your data transfer format
- serialization - it can be a local cache
- well, you can’t do without collections here