UnaryOperator Functional Interface

FunctionalInterfaces.java

// UnaryOperator
        Stream<Integer> iterate = Stream.iterate(1, new UnaryOperator<Integer>() {
            @Override
            public Integer apply(Integer integer) {
                return integer + 1;
            }
        });

        System.out.println("iterate.findFirst().get() = " + iterate.findFirst().get());


        Stream<Integer> iterate2 = Stream.iterate(1, integer -> integer + 1);

        System.out.println("iterate2.findFirst().get() = " + iterate2.findFirst().get());