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Java 16 vs Java 17

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Java 16 vs Java 17 - A key comparison and difference of the topics or subjects that will help you understand which is best for your use case. Check out to compare Java 17 and Java 16 as very common job interview questions.

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Difference between Java 16 and Java 17

Java 16 Topic one in this side-by-side comparison.

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Java 17 Topic two in this side-by-side comparison.

Java 16 Interview Online Test	Java 17 Interview Online Test
Java 16 new features: - Vector API: Java supports auto-vectorization to optimize the arithmetic algorithms, which means the Java (JIT compiler) will transform some scalar operations (one item at a time) into vector operations (multiple items at a time) automatically. Developers have no control of this vector operation conversion, it totally depends on the JIT compiler to optimize the code. - Enable C++14 Language: It allows the C++14 language features to be used in the C++ source code within the JDK. - Migrate from Mercurial to Git: Migrates the OpenJDK source code from Mercurial to Git or GitHub. - Concurrent Thread-Stack Processing: It improves the Z Garbage Collector (ZGC) by moving the ZGC thread-stack processing from safepoints to a concurrent phase. - Unix-Domain Socket Channels: The Unix-domain sockets are used for inter-process communication (IPC) on the same host, which means exchanging data between processes executing on the same host. New Unix-domain Socket classes or APIs added (New socket address class, java.net.UnixDomainSocketAddress, New enum, java.net.StandardProtocolFamily.UNIX). - Alpine Linux Port: This JEP port the JDK to Alpine Linux and other Linux distributions that use musl implementation. This JDK port enables Java to run out-of-the-box in Alpine Linux, which benefits those Java-dependent frameworks or tools like Tomcat and Spring. - Elastic Metaspace: Java 8 JEP 122 removed the PermGen (Permanent Generation) and introduced Metaspace, a native off-heap memory manager in the hotspot. Java 16 improves the metaspace memory management by returning unused HotSpot class-metadata or metaspace memory to the operating system more promptly, reducing the metaspace footprint, and simplifying the metaspace code. - Windows/AArch64 Port: This port the JDK to Windows/AArch64, running JDK + Windows on ARM hardware, server, or ARM-based laptop. - Foreign Linker API: Enables Java code to call or can be called by native code	Java 17 new features: - Java 17 is 8.66% faster than Java 11 and 2.41% faster than Java 16 for G1GC (default). - Java 17 is 6.54% faster than Java 11 and 0.37% faster than Java 16 for ParallelGC. The Parallel Garbage Collector is 16.39% faster than the G1 Garbage Collector. - Restore or Rebuild the "Always-Strict Floating-Point" Semantics - Enhanced faster the "pseudo-Random" Number Generators - New macOS rendering pipelines - macOS/AArch64 Port - Dismiss the Applet API for Removal - JDK Internals Encapsulate strongly - Switch Pattern Matching (Preview) - Activation of the Removal RMI - Generate sealed Classes - Removal of the Experimental AOT and JIT Compiler - Remove the Security Manager. - Foreign Functions and Memory API (Incubator) - Vector API (Second Incubator) - Deserialization Filters Based on Context (content-specific)

Java 16

Interview Online Test

Java 17

Interview Online Test

Java 16 new features:

- Vector API: Java supports auto-vectorization to optimize the arithmetic algorithms, which means the Java (JIT compiler) will transform some scalar operations (one item at a time) into vector operations (multiple items at a time) automatically. Developers have no control of this vector operation conversion, it totally depends on the JIT compiler to optimize the code.

- Enable C++14 Language: It allows the C++14 language features to be used in the C++ source code within the JDK.

- Migrate from Mercurial to Git: Migrates the OpenJDK source code from Mercurial to Git or GitHub.

- Concurrent Thread-Stack Processing: It improves the Z Garbage Collector (ZGC) by moving the ZGC thread-stack processing from safepoints to a concurrent phase.

- Unix-Domain Socket Channels: The Unix-domain sockets are used for inter-process communication (IPC) on the same host, which means exchanging data between processes executing on the same host. New Unix-domain Socket classes or APIs added (New socket address class, java.net.UnixDomainSocketAddress, New enum, java.net.StandardProtocolFamily.UNIX).

- Alpine Linux Port: This JEP port the JDK to Alpine Linux and other Linux distributions that use musl implementation. This JDK port enables Java to run out-of-the-box in Alpine Linux, which benefits those Java-dependent frameworks or tools like Tomcat and Spring.

- Elastic Metaspace: Java 8 JEP 122 removed the PermGen (Permanent Generation) and introduced Metaspace, a native off-heap memory manager in the hotspot. Java 16 improves the metaspace memory management by returning unused HotSpot class-metadata or metaspace memory to the operating system more promptly, reducing the metaspace footprint, and simplifying the metaspace code.

- Windows/AArch64 Port: This port the JDK to Windows/AArch64, running JDK + Windows on ARM hardware, server, or ARM-based laptop.

- Foreign Linker API: Enables Java code to call or can be called by native code

Java 17 new features:

- Java 17 is 8.66% faster than Java 11 and 2.41% faster than Java 16 for G1GC (default).

- Java 17 is 6.54% faster than Java 11 and 0.37% faster than Java 16 for ParallelGC. The Parallel Garbage Collector is 16.39% faster than the G1 Garbage Collector.

- Restore or Rebuild the "Always-Strict Floating-Point" Semantics

- Enhanced faster the "pseudo-Random" Number Generators

- New macOS rendering pipelines

- macOS/AArch64 Port

- Dismiss the Applet API for Removal

- JDK Internals Encapsulate strongly

- Switch Pattern Matching (Preview)

- Activation of the Removal RMI

- Generate sealed Classes

- Removal of the Experimental AOT and JIT Compiler

- Remove the Security Manager.

- Foreign Functions and Memory API (Incubator)

- Vector API (Second Incubator)

- Deserialization Filters Based on Context (content-specific)

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