java8之Stream

 //1.可以通过Collection系列集合提供的stream()获取串行流 或paralleStream()获取并行流
        List<String> list = new ArrayList<>();
        Stream<String> stream = list.stream();

        //2.通过Arrays中的静态方法获取 stream() 获取数组流
        Book[] books = new Book[10];
        Stream<Book> stream1 = Arrays.stream(books);

        //3.通过Stream类中的静态方法 of() 创建流
        Stream<Book> stream2 = Stream.of(books);

        //4.创建无限流(无穷尽)
        //迭代
        Stream<Integer> stream3 = Stream.iterate(0,x->x+2);
//        stream3.forEach(System.out::println);
        stream3.limit(10).forEach(System.out::println);//只取前10个

        //生成
        Stream.generate(()->Math.random()).limit(5).forEach(System.out::println);