Question

What is a terminal condition in stream? Provide an example.

Answer 1

• They can return a primitive value (booleanor long), a concrete type (Optional value object), or void (creating side effect).
• They are eagerly executed, and a terminal operation is always the last operation in a Stream pipeline.

The allMatch operation

The allMatch()operation answers the question: Do all elements in the stream meet this condition? It returns true if and only if all elements match a provided predicate, otherwise return false.

This is a short-circuiting terminal operation because the operation stops immediately if any unmatched element is found (just like short-circuit behavior of the AND operator).

The following example checks if all persons are male:

boolean areAllMale = listPersons.stream()

                .allMatch(p -> p.getGender().equals(Gender.MALE));

System.out.println("Are all persons male? " + areAllMale);