本書は
プログラミング言語Java
と
その基本ライブラリーであるjava.lang、java.util、
および
(少ないですが)java.util.concurrentとjava.io
を
みなさんが最も効果的に使用するのを手助けすることを
目的としています。
I was thinking と could express logical and like "programming language Java and its fundamental libraries, which is java.lang、java.util.
As for を particle, maybe last time (ことを) it was used to depict direct object of the する verb (しています). Unfortunately, I have no idea why を was placed after java.util.concurrentとjava.ioを noun.
Maybe this sentence too hard for me to understand it fully. And asking many times on same simple things could be discourteous...