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I'm new to processing. Love the way this language is even easier than Python! Anyway, I need to read and enter data into spreadsheets - specifically into Excel and GoogleDocs. How do I do this? Are there libraries available?
There is a library to read from excel. I don't know if there is a simple way to also write to excel. You can however use Table class, tables can be saved as csv or tsv file which may be imported into excel with ease. There's also a possibility to work with XML.
Use Java libraries. Apache POI is the way to go if you need advanced Excel support (like formatting, multiple sheets, etc.). Otherwise, CSV (or TSV or other textual formats), as advised by Ater, is fine.
Examples: https://github.com/PhiLhoSoft/Java/blob/master/Experiments/src/org/philhosoft/experiments/libraries/poi/SiteUserStats.java for writing, https://github.com/PhiLhoSoft/Java/blob/master/Experiments/src/org/philhosoft/experiments/libraries/poi/ReadExcelFile.java for reading.