From Java 17 to Java 21

Upgrade to Java 21 to use virtual threads.

Changes from Java 17 to Java 21.

Included in the book:

• Pattern matching

1. Record patterns
2. Pattern matching for switch,
3. Unnamed patterns and variables

• Multi-threading

1. Virtual threads
2. Structured concurrency
3. Scoped values

• Standard library changes

1. UTF-8 by default
2. Internet-address resolution SPI
3. Simple web server
4. Sequenced collections
5. Key Encapsulation Mechanism API

• Java languages

1. String templates
2. Code snippets in Java API documentation
3. Unnamed classes and instance main methods

• Panama project

1. Foreign Function & Memory API
2. Vector API

If you are currently using Java 11, check out another book From Java 11 to 17.