JDK 14 · JSR 389
JDK 14 is Java SE 14, JSR 389, generally available on 17 March 2020. Switch expressions become a permanent language feature. Records, pattern matching for instanceof, and text blocks are still previews. Helpful NullPointerExceptions are on by default.
A switch expression yields a value, uses arrow labels, and does not fall through those labels.
Preview in Java 12 (JEP 325) and Java 13 (JEP 354).
OpenJDK JEP 361 (leaves JavaMastery)
Related reading: Control flow
Curriculum file: versions5Java17Features.java
A record is a preview way to declare a shallowly immutable carrier of data. It is not final in Java 14.
Second preview in Java 15 (JEP 384). Final in Java 16 (JEP 395).
OpenJDK JEP 359 (leaves JavaMastery)
Related reading: Records and sealed classes
instanceof can bind the tested value to a pattern variable. This is a preview.
Second preview in Java 15 (JEP 375). Final in Java 16 (JEP 394).
Text blocks are previewed a second time. They are not yet a permanent literal.
First preview in Java 13 (JEP 355). Final in Java 15 (JEP 378).
OpenJDK JEP 368 (leaves JavaMastery)
Related reading: Strings
An incubator API reaches memory outside the Java heap. It is not a supported standard API.
This line of work becomes the Foreign Function and Memory API, which is final in Java 22 (JEP 454).
A NullPointerException can name which part of an expression was null. The feature is on by default.
CMS is removed. G1 remains the default collector from Java 9.
OpenJDK JEP 363 (leaves JavaMastery)
Related reading: JVM and memory
jpackage is an incubator tool for packaging a Java application. It is not final.
Final in Java 16 (JEP 392).
The cumulative example uses the final switch-expression syntax from this release together with later records, text blocks, and sealed classes. It is a Java 17 file.
Sources. General availability, JSR 389, and the JEP list: OpenJDK JDK 14. OpenJDK JDK 14 (leaves JavaMastery)