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This is the second of three sections on the new Stream interface in Java 8. It covers the Stream methods not already covered in Part 1, most importantly reduce (which is often combined with the earlier map method). It also covers IntStream and DoubleStream. See http://www.coreservlets.com/java-8-tutorial/ for the complete tutorial series (Lambdas and Streams in Java 8) and associated code. That site also lets you download PDF files of each lecture, for saving or printing, and includes exercises and exercise solutions.