Quick Answer
Modern Java performance features: Virtual Threads (Java 21) - millions of lightweight threads for I/O-bound workloads. Records (Java 16) - compact immutable value objects. Sealed classes for exhaustive pattern matching. JEP improvements to GC (ZGC, Shenandoah with sub-ms pauses). String templates (Java 21). Vector API for SIMD operations. Always profile with JMH before claiming an optimization helps.
Answer
Use streams and parallel streams carefully. Use Fork/Join for divide-and-conquer workloads. Leverage CompletableFuture for async tasks. Prefer immutable objects to reduce synchronization overhead.
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SugharaIQ Editorial Team
Verified Answer
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