JDK8通过Stream 对List，Map操作和互转的实现

List<Person> list = map.entrySet().stream().sorted(Comparator.comparing(e -> e.getKey())) .map(e -> new Person(e.getKey(), e.getValue())).collect(Collectors.toList());List<Person> list = map.entrySet().stream().sorted(Comparator.comparing(Map.Entry::getValue)) .map(e -> new Person(e.getKey(), e.getValue())).collect(Collectors.toList());List<Person> list = map.entrySet().stream().sorted(Map.Entry.comparingByKey()) .map(e -> new Person(e.getKey(), e.getValue())).collect(Collectors.toList());

 List<Employee> employees = persons.stream()        .filter(p -> p.getLastName().equals("l1"))        .map(p -> new Employee(p.getName(), p.getLastName(), 1000))        .collect(Collectors.toList());

User match = users.stream().filter((user) -> user.getId() == 1).findAny().get();

public class Hosting {   private int Id;  private String name;  private long websites;   public Hosting(int id, String name, long websites) {    Id = id;    this.name = name;    this.websites = websites;  }   //getters, setters and toString()} Map<Integer, String> result1 = list.stream().collect(        Collectors.toMap(Hosting::getId, Hosting::getName));