What are the differences between JDK 8 and JDK 21 in terms of new features and improvements?
sobes.tech AI
Answer from AI
JDK 8 and JDK 21 differ by a significant set of new features and improvements that have developed the Java language and platform over many years.
Main differences:
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Lambda expressions and Stream API (JDK 8): Lambda expressions were introduced in JDK 8, allowing for more concise and expressive code, as well as Stream API for convenient collection and data stream processing.
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Records (starting from JDK 14, stabilized in JDK 16): Enable creating compact, immutable classes with minimal boilerplate code.
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Pattern Matching: In JDK 21, pattern matching for instanceof and switch has been improved, simplifying type checks and data extraction.
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Virtual Threads (JDK 21): Virtual threads (Project Loom) have been introduced, significantly simplifying multithreaded programming and increasing performance through lightweight threads.
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Foreign Function & Memory API: Allows safe and efficient interaction with code and memory outside the JVM.
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Performance and security improvements: Include JVM optimizations, garbage collector enhancements (e.g., ZGC), and new capabilities for analysis and monitoring.
Thus, JDK 21 offers modern tools for improving performance, development convenience, and language capabilities, while JDK 8 laid the foundation with lambdas and Stream API.