#java-21 Clear
Tags #php #kotlin #bash #go #sql #rust #typescript #html #java #python #files #utils #strings #http #concurrency #async #json #arrays #security #types #crypto #database #dates #format
Java Virtual Threads (Java 21+)
Java 21's virtual threads are millions-of-them cheap — JVM multiplexes them onto a small carrier pool. Replaces async/reactive code for most I/O-bound workloads: just write blocking code that doesn't actually block a kernel thread.
Java Sealed Classes + Pattern Matching (Java 21+)
`sealed` restricts which classes can extend a type — perfect for closed hierarchies that pattern matching can switch over exhaustively. The compiler enforces that you handle every variant.