New Features in Java 14: Switch Expressions, Pattern Matching for instanceof, Helpful NullPointerExceptions, Records and More

Since the release of Java 13 in September 2019, new Java versions have followed a six‑month cadence, and the non‑LTS Java 14 was released on 17 March 2020.

The most notable Java 14 features are:

Standard switch expressions (JEP 361)

Pattern matching for instanceof (preview, JEP 305)

Helpful NullPointerException messages (JEP 358)

Records (preview, JEP 359)

Text blocks (preview 2, JEP 368)

Package tool (incubator, JEP 343)

NUMA‑aware G1 memory allocation (JEP 345)

JFR event streaming (JEP 349)

Non‑volatile mapped byte buffers (JEP 352)

ZGC on macOS (JEP 364) and Windows (JEP 365)

External memory access API (incubator, JEP 370)

Switch Expressions

After being previewed in Java 12 and Java 13, switch expressions became a standard feature in Java 14. They allow a more concise lambda‑style syntax, exhaustive case checking, and the use of yield to return a value from the expression.

String result = switch (day) {
    case "M", "W", "F" -> "MWF";
    case "T", "TH", "S" -> "TTS";
    default -> {
        if (day.isEmpty())
            yield "Please insert a valid day.";
        else
            yield "Looks like a Sunday.";
    }
};
System.out.println(result);

Pattern Matching for instanceof

Previously, developers had to write an explicit cast after an instanceof check. Java 14 introduces pattern matching, allowing the cast to be combined with the type test.

// Before Java 14
if (obj instanceof Article) {
    Article a = (Article) obj;
    System.out.println(a.getAuthor());
}

// Java 14 and later
if (obj instanceof Article a) {
    System.out.println(a.getAuthor());
}

Helpful NullPointerException Messages

NullPointerExceptions have long been a pain point. Java 14 improves the JVM output to include the exact expression that was null, making debugging much easier.

// Traditional stack trace
Exception in thread "main" java.lang.NullPointerException
    at NullPointerExample.main(NullPointerExample.java:5)

// Java 14 enhanced message
Exception in thread "main" java.lang.NullPointerException: Cannot invoke "Blog.getAuthor()" because the return value of "Article.getBlog()" is null
    at NullPointerExample.main(NullPointerExample.java:4)

Records (preview)

Records provide a compact syntax for data‑carrier classes. The compiler automatically generates constructors, accessors, equals , hashCode , and toString methods, reducing boilerplate similar to Kotlin data classes.

record Author() {}
// or
record Author(String name, String topic) {}

These enhancements, together with other improvements such as text blocks, package tool, and ZGC support on macOS and Windows, make Java 14 a significant step forward for developers.