import java.util.*;
import java.util.stream.*;

public class Main
{
  public static void main(String[] args)
  {
    double[] sample = {20, 12, 34, 45, 11, 23, 45};
    DoubleStream ds = Arrays.stream(sample);
    System.out.println(ds.count());

    // Another example
    ds = Arrays.stream(sample);
    ds.forEach(System.out::println);

    System.out.println("In one statement ...");
    Arrays.stream(sample).forEach(System.out::println);

    // Selection
    long count =
      Arrays.stream(sample).filter(value -> value >= 30).count();
    System.out.println(count);

    Arrays.stream(sample)
          .filter(value -> value >= 30)
          .forEach(System.out::println);

    Arrays.stream(sample)
          .filter(value -> value >= 30)
          .forEach(Main::printOneLine);

    // Saving to array
    double[] above30 =
      Arrays.stream(sample)
            .filter(v -> v > 30)
            .toArray();

    System.out.println(above30.length);
    for (int i = 0; i < above30.length; i++)
      System.out.println(above30[i]);

  }
  public static void printOneLine(double value)
  {
    System.out.print(value + " ");
  }
}