Java 11 new Features

• Java Evolution: 9 to 11 https://chatgpt.com/c/8cbcbca6-603c-4831-9da3-54bf9eb49bd5
• Java 11 - Http Client : https://chatgpt.com/c/bfa71868-583f-471e-aa68-34c3c207fe0d
• https://chatgpt.com/c/4dd4601b-75ba-473c-93fb-48626341df24

Java 9

1. JShell: A Read-Eval-Print Loop (REPL) tool.

   1. Module System (Project Jigsaw): for better modularizing of code, help to encapsulate packages.

2. Interfaces Enhancement : private methods.
3. try-with-resources statement.
4. Stream API Enhancements: takeWhile, dropWhile
5. Optional:
6. ifPresentOrElse(Consumer,Runnable)
7. stream()
8. isEmpty()
9. Diamond Operator Enhancement:
10. Allows the diamond operator to be used with anonymous classes.
11. @Deprecated(forRemoval=true) : annotation to indicate they will be removed in future releases.
12. new HTTP/2 Client: HTTP/2 and WebSocket protocol support.

13. Compact Strings in Java 9:

    • compact strings were introduced to improve memory usage for strings
    • that only contain Latin-1 characters (ISO-8859-1).
    • These strings are represented as byte arrays internally instead of char arrays, saving memory.

14. More:

15. Multi-Resolution Image API: An API for working with images at different resolutions.
16. Process : Improved API for managing and controlling operating system processes.
17. Multi-Release JARs: Allowed a single JAR to support multiple versions of Java.

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Java 10,11

1. Allows running a Java source file as a script.
2. Allowed running a single-file program without compilation (java MyClass.java).
3. Local-Variable Type Inference (var):
4. Allows the type of local variables to be inferred by the compiler.
5. use of var in lambda expressions.

   1. Nest-Based Access Control:
   2. access the private member of nested class.
   3. had to use reflection API before.

6. TLS 1.3 protocol support.

7. internal improvements:

8. Parallel Full GC for G1: G1 garbage collector now supports full GC parallelism.
9. Application Class-Data Sharing: Improves startup time and reduces memory footprint by sharing common class metadata across JVM instances.

   • Heap Allocation on Alternative Memory Devices : Experimental support for allocating the Java object heap on alternative memory devices.

10. Epsilon: A no-op garbage collector, useful for performance testing and short-lived jobs.

11. Root Certificates: Open-source root certificates to improve the OpenJDK build process.

12. Flight Recorder: tools

13. A low-overhead data collection framework for troubleshooting and profiling.