​

public class prog {

    public static void main(String[] args){

        IntStream stream1 = IntStream.of(30, 90, 70, 10);

        DoubleStream stream2 = DoubleStream.of(30.3, 90.9, 70.7, 10.1);

        System.out.println(stream1.sum());

        System.out.println(stream2.average().getAsDouble());

    }

}