1  import java.util.ArrayList;
  2  import java.util.List;
  3  import java.util.Map;
  4  import java.util.Set;
  5  import java.util.stream.Collectors;
  6  import java.util.stream.Stream;
  7  
  8  public class CollectDemo {
  9    public static void main(String[] args) {
 10      String[] names = {"Jamal", "Peter", "Soraya", "Kim", "Imani", 
 11        "Giorgio", "Alan", "Stacy", "Michelle", "jamal"};
 12      System.out.println("The number of characters for all names: " +
 13        Stream.of(names).parallel().collect(StringBuilder::new, 
 14          StringBuilder::append, StringBuilder::append).length());
 15      
 16      List<String> list = Stream.of(names).collect(ArrayList::new, 
 17        ArrayList::add, ArrayList::addAll);
 18      System.out.println(list);
 19      
 20      list = Stream.of(names).collect(Collectors.toList());
 21      System.out.println(list);
 22  
 23      Set<String> set = Stream.of(names).map(e -> e.toUpperCase()).
 24        collect(Collectors.toSet());
 25      System.out.println(set);
 26      
 27      Map<String, Integer> map = Stream.of(names).collect(
 28        Collectors.toMap(e -> e, e -> e.length()));
 29      System.out.println(map);
 30      
 31      System.out.println("The total number of characters is " +
 32        Stream.of(names).
 33          collect(Collectors.summingInt(e -> e.length())));
 34  
 35      java.util.IntSummaryStatistics stats = Stream.of(names).
 36        collect(Collectors.summarizingInt(e -> e.length()));
 37      System.out.println("Max is " + stats.getMax());
 38      System.out.println("Min is " + stats.getMin());
 39      System.out.println("Average is " + stats.getAverage());
 40    }
 41  }