J.1 Introduction
This appendix presents several additional topics to support the Android portion of the book. Sections J.2–J.9 present an overview of the Java collections framework and several examples of working with various collections that we use in our Android apps. Sections J.10–J.12 introduce file and stream concepts, overview method of class File and discuss object-serialization for writing entire objects to streams and reading entire objects from streams. Finally, Sections J.13–J.17 present the fundamentals of multithreading.
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