Refactor Your Code to Java 20
summary
Walks through concrete migrations from Java 10 to Java 21 with live examples: var local type inference to remove repetitive types, Java 15 text blocks and Java 21 string templates for multiline and templated HTML, Java 14+ switch improvements including switch as expression, arrow labels, case null, yield and type-patterns, pattern matching for instanceof and record deconstruction in for-each (Java 20 preview requires enabling), records as immutable data classes replacing boilerplate equals/hashCode/toString, Unicode emoji changes (Java 19), javadoc code snippets, sealed classes, and automation via IntelliJ/Eclipse refactors, OpenRewrite, SonarQube and Maven plugins.
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chapters (9)
- 0:00Introduction and goals
- 6:35Local variable type inference
- 10:07Modern switch statements
- 22:16Emoji support in Java
- 27:26Records for boilerplate
- 34:27Java 20 record improvements
- 39:38Code snippets in documentation
- 46:04Sealed classes overview
- 49:37Poll and closing
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