// streams/CollectionToStream.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;
import java.util.stream.*;

public class CollectionToStream {
 public static void main(String[] args) {
 List<Bubble> bubbles = Arrays.asList(
 new Bubble(1), new Bubble(2), new Bubble(3));
 System.out.println(
 bubbles.stream()
 .mapToInt(b -> b.i)
 .sum());

 Set<String> w = new HashSet<>(Arrays.asList(
 "It's a wonderful day for pie!".split(" ")));
 w.stream()
 .map(x -> x + " ")
 .forEach(System.out::print);
 System.out.println();

 Map<String, Double> m = new HashMap<>();
 m.put("pi", 3.14159);
 m.put("e", 2.718);
 m.put("phi", 1.618);
 m.entrySet().stream()
 .map(e -> e.getKey() + ": " + e.getValue())
 .forEach(System.out::println);
 }
}
/* Output:
6
a pie! It's for wonderful day
phi: 1.618
e: 2.718
pi: 3.14159
*/