The following describes selected improvements of the Java JVM. See the Java 18 release notes.
With JEP-400, now UTF-8 is the default charset of the standard Java APIs.
In JDK 17 and earlier, the default charset is determined when the Java runtime starts. On macOS, it is UTF-8 except in the POSIX C locale. On other operating systems, it depends upon the user’s locale and the default encoding, e.g., on Windows, it is a codepage-based charset such as windows-1252 or windows-31j.
The following describes selected improvements of the Java language. See the Java 18 release notes. See Java Language Updates for Java SE 18.
Java 18 is introducing the following language enhancements as developer preview.
JEP 420 is continuing with Pattern Matching for switch.
With a snippet region defined we can include a fragment of compileable and tested code.
Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/eighteen/tooling/JavaDocSnippetTag.java[tag=snippetInclude]With a snippet tag we can just inline code. There is no need to escape or use HTML.
The following describes selected improvements of the Java tooling. See the Java 18 release notes.
Java 18 is introducing the following tooling enhancements.
JEP 408 is adding the jwebserver tool that can serve static files and support the HEAD and GET methods.
This is simplifying situations where a simple web server is needed for example for testing and eliminating the need for external dependencies.
In case a more customized web server is required, we can use the implementations from the package com.sun.net.httpserver which constitutes the base for jwebserver.
JEP 413 is adding support to include Java code snippets either from external sources of inline snippets. Nicolai Parlog has a pretty decent summary of some of the features builtin. See https://nipafx.dev/inside-java-newscast-20/#code-in-javadoc
The following describes selected improvements of the Java API. See the Java 11 release notes.
Unresolved directive in <stdin> - include::PredicateApi.adoc[leveloffset=+1] Unresolved directive in <stdin> - include::StringApi.adoc[leveloffset=+1] Unresolved directive in <stdin> - include::CollectionApi.adoc[leveloffset=+1] Unresolved directive in <stdin> - include::FilesApi.adoc[leveloffset=+1]