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));