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, Listlist) { 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 list1 = Arrays.asList(new User(1, "小明"), new User(2, "小花"), new User(3, "小华"), new User(4, "小东")); List list2 = Arrays.asList(new User(1, "小明2"), new User(2, "小花2"), new User(3, "小华2")); List 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());
Original: https://www.cnblogs.com/mike-mei/p/16310004.html
Author: 南北12345678
Title: java8两个list根据某一属性取交集
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