Since the first edition, Java has adopted a six-month release cycle with periodic longterm releases; that means the current supported releases that coincide with publica‐ tion are Java 8 and Java 11. Although the first edition covered Java 8, it was quite new at the time. This edition focuses on a much more mature Java 8 and Java 11, with major updates to the G1 garbage collector and Java Flight Recorder. Attention is also given to changes in the way Java behaves in containerized environments.
This edition covers new features of the Java platform, including a new microbe‐ nchmarking harness (jmh), new just-in-time compilers, application class data sharing, and new performance tools—as well as coverage of new Java 11 features like compact strings and string concatenation.
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