java8 Stream

import java.util.Collection;
import java.util.HashSet;

public class CollectionStream {
public static void main(String[] args) {
Collection books = new HashSet();
books.add("java");
books.add("疯狂");
books.add("C");
System.out.println(books.stream().filter(ele->((String)ele).contains("疯狂")).count());
System.out.println(books.stream().filter(ele->((String)ele).length()>1).count());
books.stream().mapToInt(ele->((String)ele).length()).forEach(System.out::println);
}
}