Virtual threads in Java 21 revolutionize concurrency by enabling applications to handle thousands of concurrent tasks with minimal overhead. Unlike traditional platform threads that are heavyweight and limited by OS resources, virtual threads are JVM-managed, lightweight, and stored on the heap. They eliminate the complexity of reactive programming while providing superior performance for I/O-bound operations. The article demonstrates through code examples how virtual threads can reduce execution time from 5 seconds to 1 second for the same workload, making them ideal for web applications, microservices, and database-driven systems that require high concurrency without sacrificing code simplicity.
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