Runnable examples · Key points · Java 8 → 21

Java Feature Explorer

Every major Java feature from 8 to 21 — with runnable code you can tweak live in the playground. Stop memorising, start understanding.

Java 8

Lambdas, Streams, Optional, Date/Time API

Java 11

var, String methods, HTTP Client

Java 17 LTS

Records, Sealed Classes, Pattern Matching

Java 21 LTS

Virtual Threads, Switch Patterns, Sequenced Collections

Java 84 features

The landmark release — lambdas, streams, Optional, and the new Date/Time API transformed how Java is written. Most interview questions about "modern Java" mean Java 8.

Java Feature Explorer

Lambda Expressions

Stream API

Optional<T>

Date/Time API