I do contract work for a living, which could include writing a program such as this. However, I don’t do people’s homework for them. That just robs them of an education.
You have my full permission to implement this project in any way you please and to keep all the profits from your endeavor.
To implement it, you create an array of sample Objects in RAM. The sample class would have a variety of data types, e.g. some ints, some longs, some Dates, some Strings.
You then write this data out in various formats: ObjectOutputStream, DataOutputStream, FileWriter, CSV, XML, ASN.1 etc.
Then you measure the size of each of the output files and report on just how fluffy each format is.
You don’t need to write much code. The FileIO Amanuensis will generate code for ObjectOutputStream, DataOutputStream, and FileWriter. For CSV, see CSVWriter. For XML, see XML built-in classes. For ASN.1 see ASN.1.
For a simpler project, leave out XML and ASN.1. For a more difficult project, add extra formats, e.g. SQL databases from various vendors.
People can plop in their own datastructures into your framework to see the difference in their own projects. Leave instructions in the code, and structure the code, to make this easy.
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