public class Main {    public static void main(String[] args) {        LongStream ls =LongStream.generate(new LongSupplier() {            long a=0;            long b=1;            long c=0;            @Override            public long getAsLong(){                c=a+b;                a=b;                b=c;                return c;            }        });        ls.limit(20).forEach(System.out::println);    }}