Introduction to Programming

Finding any or first

The following Terminal operations allow us to find any, or the first, element of the stream:

• Optional<T> findAny(): Returns Optional with the value of any element of the stream, or an empty Optional if the stream is empty.
• Optional<T> findFirst(): Returns Optional with the value of the first element of the stream, or an empty Optional if the stream is empty.

The following example illustrates these operations:

List<String> list = List.of("1", "2", "3", "4", "5");Optional<String> result = list.stream().findAny();System.out.println(result.isPresent());    //prints: trueSystem.out.println(result.get());          //prints: 1result = list.stream().filter(e -> "42".equals(e)).findAny();System.out.println(result.isPresent());    //prints: ...