Demystifying the Most Significant Java Language Features from 9 to 11
summary
Shows concrete internals and measured effects: JDK 9 replaces char[] with a byte[] plus a coder so bytecode size and memory drop for Latin‑1 strings but benchmarks using JMH find disabling compact strings can speed UTF‑16‑heavy workloads. String concat moves to invoke-dynamic with six runtime strategies and the default char‑array strategy gives lowest allocations. Stack‑walking costs 1–3 ns per frame, spinWait avoids context switches, collection factory overloads avoid varargs heap copies for up to ten elements, var enables non‑denotable types, nests remove synthetic bridge methods.
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chapters (12)
- 0:00Introduction
- 1:59Private Interface Methods
- 5:12String Compaction
- 8:45String Construction
- 11:39String Comparison
- 13:52String Concatenation
- 15:42InvokeDynamic
- 20:31Stack Walking
- 25:48SpinWeight
- 28:41Collection Factoring
- 33:06Type Inference
- 37:07Nesting Access Control
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