Why was java defined such that methods may take as input multiple parameters,
but may only return a single object (or void)?
Did it make the language somehow easier to implement or use?
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Probably because this is the way that C and C++ do it, and the Java language syntax is very similar to (and probably based on) those languages.
In fact, according to this article, Gosling started by extending the C++ compiler, so it makes sense that he would follow much of the same syntax: