public static void main(String[] args) {
List<User> list = new ArrayList<>();
User user1 = new User();
user1.setId("1");
user1.setUsername("小明");
list.add(user1);
User user2 = new User();
user2.setId("2");
user2.setUsername("小张");
list.add(user2);
User user3 = new User();
user3.setId("3");
user3.setUsername("小莉");
list.add(user3);
User user4 = new User();
user4.setId("4");
user4.setUsername("大聪明");
list.add(user4);
System.out.println(list);
List<String> idList = new ArrayList<>();
idList.add("1");
idList.add("3");
//使用lambda表达式获取ID为1和3的List<User>
List<User> resList = new ArrayList<>();
}
@Data
public class User {
private String id;
private String username;
}
筛选出来id为1和3的list
stream是比较常用的 建议去找下相关文章 深入学习下
List<User> collect = list.stream().filter(user -> "1".equals(user.getId()) || "2".equals(user.getId())).collect(Collectors.toList());
Stream.filter 可以解决