This presentation reflects information available to the Technology Division of Goldman Sachs only and not any other part of Goldman Sachs. It should not. - ppt download
Processing Data with Java SE 8 Streams, Part 1(Java SE 8ストリームを使用したデータ処理、パート1) | Oracle 日本
Java 8 Streams - Lazy evaluation
Java 8 Stream API introduction with examples - Java Tutorials