The changes from Java 8 to Java 9 have been little (except the modul system, but as long as it’s unclear where the journey is leading to, it can be ignored). This includes the new modul system of Java 9, the very limited support lifecycles, and the fact that there will be a new “major” version every 6 months. Especially not today, since many Java related topics are currently changing, not yet fully answered, or in motion. I’m not that kind of person that jumps on every brand new version as soon as it comes out. In this article, I want to show you some examplary questions about some implementation specifics and how these questions can be answered by looking at the OpenJDK source code. Having the Java implementation of the Java API at hand can prove very useful. Even though it has been possible to obtain the source code of the Java classes prior to 2007 (by obtaining a Sun Microsystems account and accepting some license terms), it is now “officially open”. Today’s reference implementation of the Java Development Kit (JDK), OpenJDK, has been free and open source since 2007. This blog post covers an interesting aspect of Java.
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