class User {
public User(Integer id, String name) {
this.id = id;
this.name = name;
}
private Integer id;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "id =" + id + ", name = " + name;
}
}
public class Demo {
private static User find(Integer id, List<User> list) {
User user = null;
for (int i = 0; i < list.size(); i++) {
if (id.equals(list.get(i).getId())) {
user = list.get(i);
}
}
return user;
}
public static void main(String[] args) {
List<User> list1 = Arrays.asList(new User(1, "小明"), new User(2, "小花"), new User(3, "小华"), new User(4, "小东"));
List<User> list2 = Arrays.asList(new User(1, "小明2"), new User(2, "小花2"), new User(3, "小华2"));
List<User> result = list1.parallelStream().map( user ->{
User user1 = list2.stream().filter(u -> u.getId().equals(user.getId())).findFirst().orElse(null);
if(null != user1){
user.setName(user1.getName());
}
return user;
}).collect(Collectors.toList());
