Stable Values in Java 25

Java 25 introduces the Stable Value API (JEP 502) to solve the trade-off between immutability and delayed initialization. StableValue acts as a thread-safe wrapper that guarantees single initialization while enabling deferred computation of expensive objects. The API includes StableSupplier for lazy initialization, StableList and StableMap for collections with on-demand element computation, and StableFunction for memoized function calls. This approach maintains immutability benefits and JVM optimization opportunities while avoiding upfront initialization costs that can slow application startup.