http://blog.jamesdbloom.com/JVMInternals.html#constant_pool
https://dzone.com/articles/string-memory-internals
http://*.com/questions/1281549/memory-leak-traps-in-the-java-standard-api/1281569#1281569
http://*.com/questions/5546280/understanding-javaps-output-for-the-constant-pool
http://blog.jamesdbloom.com/JavaCodeToByteCode_PartOne.html
http://www.javaranch.com/journal/200409/Journal200409.jsp#a1
http://*.com/questions/10209952/what-is-the-purpose-of-the-java-constant-pool
http://*.com/questions/23252767/string-pool-vs-constant-pool
http://java-performance.info/string-intern-in-java-6-7-8/
http://java-performance.info/string-intern-java-6-7-8-multithreaded-access/
http://theopentutorials.com/tutorials/java/strings/string-literal-pool/
http://jimlife.wordpress.com/2007/08/10/java-constant-pool-string/
http://rednaxelafx.iteye.com/blog/774673
http://rednaxelafx.iteye.com/blog/1042464
http://rednaxelafx.iteye.com/blog/1969833
http://rednaxelafx.iteye.com/blog/1969861