http://www.ibm.com/developerworks/java/library/j-java-streams-1-brian-goetz/index.html
http://www.ibm.com/developerworks/java/library/j-java-streams-2-brian-goetz/index.html
http://www.ibm.com/developerworks/java/library/j-java-streams-3-brian-goetz/index.html