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jdk 21: The new features in Java 21

JDK 21 is scheduled to be released in September 2023 as specified in  JSR 395.

The main 3 features included in JDK 21 are 

a) Sequenced Collections

According to OpenJDK, a sequenced collection has first and last elements, and the elements between them have successors and predecessors. A sequenced collection supports common operations at either end, and it supports processing the elements from first to last and from last to first (i.e., forward and reverse).

b) Virtual Threads

According to OpenJDKVirtual threads are lightweight threads that dramatically reduce the effort of writing, maintaining, and observing high-throughput concurrent applications.

c) String Templates (Preview)

 According to OpenJDKEnhance the Java programming language with string templates. String templates complement Java's existing string literals and text blocks by coupling literal text with embedded expressions and template processors to produce specialized results


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