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JDK17-java-se-language-updates.pdf
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JDK17-java-se-language-updates
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Java Platform, Standard Edition
Java Language Updates
Release 17
F40865-03
July 2022
Java Platform, Standard Edition Java Language Updates, Release 17
F40865-03
Copyright © 2017, 2022, Oracle and/or its affiliates.
This software and related documentation are provided under a license agreement containing restrictions on
use and disclosure and are protected by intellectual property laws. Except as expressly permitted in your
license agreement or allowed by law, you may not use, copy, reproduce, translate, broadcast, modify, license,
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engineering, disassembly, or decompilation of this software, unless required by law for interoperability, is
prohibited.
The information contained herein is subject to change without notice and is not warranted to be error-free. If
you find any errors, please report them to us in writing.
If this is software or related documentation that is delivered to the U.S. Government or anyone licensing it on
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Contents
Preface
Audience v
Documentation Accessibility v
Diversity and Inclusion v
Related Documents v
Conventions v
1
Java Language Changes
Java Language Updates for Java SE 17 1-1
Java Language Updates for Java SE 16 1-1
Java Language Updates for Java SE 15 1-2
Java Language Changes for Java SE 14 1-3
Java Language Changes for Java SE 13 1-3
Java Language Changes for Java SE 12 1-4
Java Language Changes for Java SE 11 1-4
Java Language Changes for Java SE 10 1-4
Java Language Changes for Java SE 9 1-5
More Concise try-with-resources Statements 1-5
@SafeVarargs Annotation Allowed on Private Instance Methods 1-6
Diamond Syntax and Anonymous Inner Classes 1-6
Underscore Character Not Legal Name 1-6
Support for Private Interface Methods 1-6
2
Preview Features
3
Sealed Classes
4
Pattern Matching
Pattern Matching for instanceof 4-4
iii
Preface
This guide describes the updated language features in Java SE 9 and subsequent releases.
Audience
This document is for Java developers.
Documentation Accessibility
For information about Oracle's commitment to accessibility, visit the Oracle Accessibility
Program website at http://www.oracle.com/pls/topic/lookup?ctx=acc&id=docacc.
Access to Oracle Support
Oracle customers that have purchased support have access to electronic support through My
Oracle Support. For information, visit http://www.oracle.com/pls/topic/lookup?ctx=acc&id=info
or visit http://www.oracle.com/pls/topic/lookup?ctx=acc&id=trs if you are hearing impaired.
Diversity and Inclusion
Oracle is fully committed to diversity and inclusion. Oracle respects and values having a
diverse workforce that increases thought leadership and innovation. As part of our initiative to
build a more inclusive culture that positively impacts our employees, customers, and
partners, we are working to remove insensitive terms from our products and documentation.
We are also mindful of the necessity to maintain compatibility with our customers' existing
technologies and the need to ensure continuity of service as Oracle's offerings and industry
standards evolve. Because of these technical constraints, our effort to remove insensitive
terms is ongoing and will take time and external cooperation.
Related Documents
See JDK 17 Documentation.
Conventions
The following text conventions are used in this document:
Convention
Meaning
boldface
Boldface type indicates graphical user interface elements associated with an
action, or terms defined in text or the glossary.
v
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