Do terminal operations on streams close the source? [duplicate]

Answer 1

Terminal operators do NOT close the stream automatically. Consider this code:

Stream list = Files.list(directory).onClose(() -> System.out.println("Closed"));
list.forEach(System.out::println);

This does NOT print "Closed".

However, the following does print "Closed":

try (Stream list = Files.list(directory).onClose(() -> System.out.println("Closed"))) {
    list.forEach(System.out::println);
}

So the best way to do it is to use the try-with-resources mechanism.