String.intern in Java 6, 7 and 8 - string pooling - Java Performance Tuning Guide

String.intern in Java 6, 7 and 8 - string pooling  - Java Performance Tuning Guide

Menu String.intern method was implemented in Java 6 and what changes were made in it in Java 7 and Java 8. First of all I want to thank Yannis Bres for inspiring me to write this article. 07 June 2014 update: added 60013 as a default string pool size since Java 7u40 (instead of Java 8), added -XX:+PrintFlagsFinal This is an updated version of this article including -XX:StringTableSize=N String.intern() String pooling String pooling (aka string canonicalisation) is a process of replacing several String objects with equal value but different identity with a single shared String object. You can achieve this goal by keeping your own Map (with possibly soft or weak references depending on your requirements) and using map values as canonicalised values. Or you can use String.intern() At times of Java 6 using String.intern() was forbidden by many standards due to a high possibility to get an OutOfMemoryException String.

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