berubou / java8

JAVA8

Stream

• generate 100 random distinct int
• Equal difference series

Stream

generate 100 random distinct int

back

public class test {
    // define a supplier
    private class randomS implements Supplier<Integer> {
        @Override
        public Integer get() {
            return new Random().nextInt(100);
        }
    }

    @Test
    public void test() {
        Integer[] i = {0};
        // generate Stream
        Stream.generate(new randomS())
                // no repeating
                .distinct()
                // limit quantity
                .limit(100)
                // give a sort
//                .sorted((a, b) -> a < b ? 1 : (a.equals(b)) ? 0 : -1)
                // terminal ： print out 
                .forEach(t -> {
                    i[0]++;
                    System.out.print(t + ",,," + (i[0]) + "\n");
                });

                //Another way
//        IntStream.generate(() -> (int) (System.nanoTime() % 100))
//                .distinct()
//                .limit(10)
//                .forEach(System.out::println);
    }
}

Equal difference series

back

Stream.iterate(0, n -> n + 3)
      .limit(10)
      . forEach(x -> System.out.print(x + " "));