Java 22 is born! And you are already outdated!

Java 22 was released on March 19th and brings more than 10 JEPs. Do you know them?

Knowing them is essential to delivering better solutions, don’t you believe it? Come with me to learn about them and how to take advantage of them.

Transcript

1. Java 22 is born! And you are already outdated! Thiago Bomfim
2. Table of Contents Increase Development Productivity Performance and Garbage Collector Frameworks and Future How to stay up to date with the news 01 01 02 03 04
3. Increase Development Productivity 01
4. JEP - JDK Enhancement Proposal JEP is a document whose purpose is to add an enhancement to Java.
5. String
6. String
7. String JEP 378: Text Blocks Java 15
8. String JEP 430: String Templates (Preview) Java 21
9. String JEP 459: String Templates (Second Preview) Java 22
11. String
12. String
13. String
14. String JEP 378: Text Blocks Java 15
15. String JEP 459: String Templates (Second Preview) Java 22
16. String JEP 459: String Templates (Second Preview) Java 22
18. InstanceOf
19. InstanceOf
20. InstanceOf JEP 394: Pattern Matching for instanceof Java 16
21. InstanceOf JEP 441: Pattern Matching for switch Java 21
22. InstanceOf
23. InstanceOf Polymorphism
25. InstanceOf
26. InstanceOf
27. InstanceOf JEP 394: Pattern Matching for instanceof Java 16
28. InstanceOf JEP 441: Pattern Matching for switch Java 21
32. InstanceOf
33. InstanceOf JEP 409: Sealed Classes Java 17
34. InstanceOf JEP 441: Pattern Matching for switch Java 21
35. InstanceOf JEP 409: Sealed Classes Java 17
36. InstanceOf JEP 441: Pattern Matching for switch Java 21
40. Records
41. JEP 395: Records Java 16 Records
42. JEP 395: Records Java 16 Records JDK-8247444 Trust final fields in records
43. Can we use Record for pattern matching?
44. JEP 440: Record Patterns Java 21 Record Patterns
45. Record Patterns JEP 440: Record Patterns Java 21
46. Can we have a Record inside a Record?
47. Record Patterns
48. Record Patterns
49. Record Patterns JEP 358: Helpful NullPointerExceptions Java 14
50. Record Patterns
51. Record Patterns JEP 440: Record Patterns Java 21
52. JEP 286: Local-Variable Type Inference Java 10 Record Patterns
53. JEP 443: Unnamed Patterns and Variables (Preview) Java 21 Record Patterns
54. JEP 456: Unnamed Variables & Patterns Java 22 Record Patterns
55. Record Patterns
57. Main
58. JEP 445: Unnamed Classes and Instance Main Methods (Preview) Java 21 Main
59. JEP 463: Implicitly Declared Classes and Instance Main Methods (Second Preview) Java 22 Main
61. Collections
62. JEP 431: Sequenced Collections Java 21 Collections
63. Collections JEP 431: Sequenced Collections Java 21
68. Stream
69. Stream JEP 461: Stream Gatherers (Preview) Java 22
71. Constructor
72. Constructor
73. JEP 447: Statements before super(...) (Preview) Java 22 Constructor
74. The goal of Project Amber is to explore and incubate smaller, productivity-oriented Java language feature. • Pattern Matching for Switch • Pattern Matching for Instanceof • Unnamed Classes and Instance main methods • Local-Variable Type Inference (var) • Records • Sealed Classes • String Templates • Text Blocks • Switch Expressions • Unnamed Patterns and Variables • Statements before super(…) (Preview) Project Amber
75. Performance and Garbage Collector 02
77. A. 2 B. 3 C. 4 D. 5 E. > 5 F. Do we have more than one? How many GC are there ?
78. A. 2 B. 3 C. 4 D. 5 E. > 5 F. Do we have more than one? How many GC are there ?
80. Parallel GC • Is the default until Java 9 • Is more focused on throughput
81. CMS • Was replaced by G1GC • It was removed by JEP 363 - Remove the Concurrent Mark Sweep (CMS) Garbage Collector, after Java 14
82. G1 • Is the default since Java 9 by JEP 248: Make G1 the Default Garbage Collector • More focus on the balance between throughput and latency
83. G1 G1 continues to be improved: - JEP 423: Region fix for G1, on Java 22 - JDK-8272773 - Configurable Card Table Card Size (-XX:GCCardSizeInBytes) available on java 18
84. Shenandoah • Lower latency GC • JEP 379: Shenandoah: A Low-Pause-Time Garbage Collector (Production), available on Java 15 for production
85. ZGC • Lower latency GC • JEP 377: ZGC: A Scalable Low-Latency Garbage Collector (Production), available on Java 15 for production • Improving in ZGC on Java 21 - JEP 439: Generational ZGC
86. Frameworks and Future 03
92. Java 22 • JEP 454: Foreign Function & Memory API • JEP 457: Class-File API (Preview) • JEP 458: Launch Multi-File Source-Code Programs • JEP 460: Vector API (Seventh Incubator) • JEP 462: Structured Concurrency (Second Preview) • JEP 464: Scoped Values (Second Preview) …
93. Java 23 and Future • JEP 455: Primitive types in Patterns, instanceof, and switch (Preview) • JEP 404: Generational Shenandoah (Experimental) • JEP 401: Value Classes and Objects (Preview) • JEP 467: Markdown Documentation Comments • JEP 468: Derived Record Creation (Preview)
96. How to stay up to date with the news 04
97. How to stay up to date? Follow the OpenJDK documentation: https://openjdk.org/projects/jdk/
98. How to stay up to date? Search more JEPS: https://chriswhocodes.com/jepsearch.html
99. How to stay up to date? Not all improvements are done by JEP, so you can follow the release notes from Oracle https://www.oracle.com/java/technologies/javase/22-relnote-is sues.html
100. How to stay up to date? Follow by blog, where I’m posting about best practices, and also more tips to help you improve your productivity with Java 😁 https://devjava.substack.com/
101. https://www.linkedin.com/in/thiagobfim/ https://github.com/ThiagoBfim Thank you!