Let me start this article with an interesting statistic (based on the research conducted by the JDK development team):
- 25 percent of Java applications memory is filled up with strings.
- 13.5 percent are duplicate strings in Java applications.
- Average string length is 45 characters.
Yes, you are right — 13.5 percent of memory is wasted due to duplicate strings. 13.5 percent is the average amount of duplicate strings present in Java application. To figure out how much memory your application is wasting because of duplicate strings, you may use tools like HeapHero, which can report how much memory is wasted because of duplicate strings and other inefficient programming practices.