This article explains Java JDK 15’s sealed class feature, showing how to declare sealed classes, the required permits clause, and the necessary final, sealed, or non‑sealed modifiers for subclasses, illustrated with complete code examples.
Explore the key Java 15 enhancements—including Text Blocks for effortless multiline strings, Records and local records for concise data models, Pattern Matching for streamlined type checks, Sealed Classes to control inheritance, and the low‑latency ZGC—plus practical IDE tips for using these features effectively.
Spring Boot 2.3.3 has been released, offering initial support for JDK 15, a Maven parent pom snippet, 67 bug fixes and enhancements—including HTTP/2 improvements, configuration fixes, and numerous dependency upgrades—along with updated documentation and a link to the full release notes.
This article explains Java's Text Block feature (JEP 355), showing how it turns cumbersome, escape‑heavy multiline strings into clean, readable literals, details its processing steps, new escape sequences, and how to control indentation with the indent() method.
