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Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136)

Name: Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136)
Availability: InStock
Rating: 4.6 (5878 reviews)

4.6 out of 5 rating
Last updated : 23/07/2026
English

Available as Instructor Led Training, Live Online & In Person at your Offices or Ours.

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Download Overview

Duration:

8.00 hours

6.5 CPD hours

Description:

There have been a lot of changes in the Java programming language since the release of Java 11 in September of 2018. Migrating to Java 21 / Java 21 New Features and Skills is a one day course that focuses on the changes that will be most noticable for Java developers who will make the transition from Java 17 to Java 21.

This course blends expert instruction and practical, hands-on experience, focusing on bridging the gap between your current Java knowledge and the latest version. Understanding that many developers are now transitioning projects from older versions of Java, this course is your key to making that shift both quickly and effectively. Throughout the course, Throughout the course, you'll dive deep into Java 21's key features, such as Records for efficient data management, enhanced text manipulation with String and Text Blocks, the introduction of Sealed Classes, and the refinements in Switch Expressions and Pattern Matching. These updates are not mere enhancements but pivotal tools that will streamline your coding practices and make your development process more efficient. The real-world labs enable you to quickly pick up useful practical skills you'll be able to apply seamlessly into your work.

Whether you're upgrading existing projects or embarking on new ones, the skills and insights gained here will empower you to use Java 21 efficiently and innovatively. This course is more than just an upgrade in your Java knowledge; it's a comprehensive enhancement of your development skills, preparing you to tackle modern challenges with renewed expertise and confidence.

Course Outline:

1. Versions and Features
¢ Quick Review of Java versions since Java 8
¢ (Non) LTS releases
¢ Preview features
¢ Java Language Specifications
¢ Java Specification Requests
¢ Java Enhancement Proposals
¢ Tutorial: IntelliJ Community Edition 2023 Quickstart (Using Maven)

2. Records
¢ Data objects in Java
¢ Introduce records as carrier of immutable data
¢ Defining records
¢ The Canonical constructor
¢ Compact constructors

3. String and Text Blocks
¢ Discuss the definition of whitespace in Java
¢ Introduce the strip() methods of the String class
¢ The isBlank() and repeat() methods introduced in Java 11
¢ Using the lines() method to construct a Stream instance using a String
¢ Compact strings
¢ Introducing Text Blocks
¢ Indentation in text blocks

4. Sealed Classes
¢ Introduce sealed classes
¢ The sealed and permits modifier
¢ Sealed interfaces
¢ Sealed classes and pattern matching
5. Switch Expressions
¢ Switch Expressions
¢ Using yield
¢ Discuss switch fall through

6. Pattern Matching
¢ Pattern Matching for instanceof
¢ Scope of variable when using pattern matching
¢ Refining Patterns in switch
¢ Dominance of pattern labels
¢ Pattern Matching in switch statements
¢ Pattern Matching and sealed classes
¢ Record Patterns

7. Exception Handling
¢ Enhanced try-with-resources
¢ Helpful NullpointerExceptions
¢ Excluding parameter names in error messages
8. Overview of Virtual Threads
¢ Introduce Virtual Threads
¢ Virtual vs System Threads
¢ Creating and running a Virtual Thread
¢ Scheduling a Virtual Thread
¢ Pinned Virtual Threads

Additional Topic: Time Permitting

More Updates
¢ private methods in interfaces
¢ The forRemoval and since attributes of the Deprecated annotation
¢ Multi-release JAR files
¢ Javadoc updates
¢ Class-Data Sharing
¢ Application Class-Data
¢ CompactNumberFormat
¢ Deprecation of the finalize method

Available Delivery Options for Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136)

Live Instructor Led Classroom Online (Live Online)
Traditional Instructor Led Classroom training (TILT/ILT)
Delivery at your offices in United Kingdom
Private dedicated course for your staff

How many CPD hours does Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136) provide?

The 1 day Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136) course gives you up to 6.5 CPD hours/structured learning hours.

Who is the correct audience for Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136)?

This is an intermediate- level Java programming course, designed for experienced Java 17 developers who wish to get up and running with Java 21 immediately. Attendees should have a working knowledge of developing Java 17 applications. This course is not for non-developers, or developers new to Java.

Do you provide training for Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136)?

Yes, we provide corporate training, dedicated training and closed classes for Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136). This can take place anywhere in United Kingdom including London, Manchester, Birmingham, Edinburgh or live online.

What is the duration of Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136)?

The Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136) training takes place over 1 day(s), with each day lasting approximately 8.00 hours including breaks.

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Why are Nexus Human the best provider for Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136)?

Nexus Human are recognised as one of the best training companies. Our trainers have won awards including Small Firms Best Trainer, national training partner of the year for Ireland, and global top 30 instructor awards in 2012, 2019 and 2021.

Is there a discount code for Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136)?

Yes, the discount code PENPAL5 is currently available for Migrating Java 17 to Java 21 | Java 21 New Features and Skills (TT2136) training. Only one discount code can be used per booking.

DURATION 8.00 Hours

No scheduled classes available at this time.

Training Insurance Included!

When you organise training, we understand that there is a risk that some people may fall ill, become unavailable.

To mitigate the risk we include training insurance for each delegate enrolled on our public schedule, they are welcome to sit on the same Public class within 6 months at no charge, if the case arises.