“Disebabkan oleh: java.lang.illegalstateException: Stream telah dioperasikan atau ditutup” Kode Jawaban

Disebabkan oleh: java.lang.illegalstateException: Stream telah dioperasikan atau ditutup

Supplier<Stream<String>> streamSupplier 
  = () -> Stream.of("A", "B", "C", "D");
Optional<String> result1 = streamSupplier.get().findAny();
System.out.println(result1.get());
Optional<String> result2 = streamSupplier.get().findFirst();
System.out.println(result2.get());