What Are the Top 5 Java 14 Features You Should Know?

1. instanceof Pattern Matching

The preview feature adds pattern matching to the instanceof operator, allowing a type check and a cast in a single expression. Traditional code such as:

if (obj instanceof Integer) {
    int intValue = (Integer) obj;
    // ...use intValue...
}

can be simplified to:

if (obj instanceof Integer i) {
    // ...use i directly...
}

More complex chains of if/else can be expressed with concise pattern matches, and the same idea can later be extended to switch expressions.

2. Text Blocks (Preview)

Re‑introduced as a preview feature, text blocks let developers write multi‑line string literals without explicit newline characters. They also add two new escape sequences: the backslash‑newline escape ("\") to suppress line breaks and the \s escape to insert a single space.

String text = """
    This is a string splitted
    in several smaller
    strings.
""";

Using \s ensures trailing spaces are preserved, which is useful for aligning columns in generated output.

3. Record Types

Records provide a compact syntax for declaring immutable data carriers. A record automatically generates equals, hashCode, and toString implementations based on its components. record Point(int x, int y) { } The equivalent traditional class would require explicit fields, a constructor, and the aforementioned methods.

Two new reflection methods— Class.getRecordComponents() and Class.isRecord() —support runtime inspection of record types.

4. jpackage Tool (Incubator)

The previously removed packaging tool returns as an incubator feature. jpackage enables developers to create self‑contained Java applications, leveraging the existing javapackager infrastructure. It supports native installers, custom launch parameters, and can be invoked via command line or the ToolProvider API.

5. Deprecation of ParallelScavenge + SerialOld GC

JEP 366 deprecates the ParallelScavenge + SerialOld garbage‑collector combination because it is rarely used and requires substantial maintenance. The deprecation signals that future releases will encourage alternative collectors.

Conclusion

Java 14’s preview features—especially instanceof pattern matching—offer immediate productivity gains, while records and text blocks improve code readability. The new jpackage tool simplifies distribution, and the GC deprecation cleans up the runtime options. All changes are preview‑only, so developers should test them thoroughly before production use.