StaticJava.java

public class StaticJava {

    // Can only be created at build-time for static java
    sealed interface RuntimeLocal<T> permits InternalRuntimeLocal {
        // VM could knwo about this and optimize invocations
        T get();

        static <T> RuntimeLocal<T> of(Supplier<T> supplier) {}
        static <T> RuntimeLocal<T> ofLazy(Supplier<T> supplier) {}
    }

    sealed interface ReinitLocal<T> permits InternalRuntimeLocal {
        T get();

        static <T> ReinitLocal<T> of(Supplier<T> supplier) {}
        static <T> ReinitLocal<T> of(Supplier<T> supplier, Consumer<T> cleaner) {}
    }
    
    static class MixAndMatch {
        private static final MethodHandle MH = null; // Initialized as normal
        private static final RuntimeLocal<LocalDateTime> RUNTIME_TIME = RuntimeLocal.of(LocalDateTime::now);
        private static final ReinitLocal<LocalDateTime> PROCESS_TIME = ReinitLocal.of(LocalDateTime::now);
        
        public static void printApplicationStart() {
            System.out.println("Application started running at " + RUNTIME_TIME.get());
        }
        
        public static void printApplicationProcessStart() {
            System.out.println("Application started running in this process at " + PROCESS_TIME.get());
        }
    }
}