【java8】java8取出list中的对象的某一属性

public class UserEntity implements Serializable {

    private Integer id;

    /**

     * 用户名

     */

    private String userName;

    /**

     * 用户手机号

     */

    private String phone;

}

public static void main(string args[]){

    List<UserEntity> users=new ArrayList<>();

    users.add(new UserEntity(1,"张三","18399990000"));

    users.add(new UserEntity(2,"王五","18399990023"));

    users.add(new UserEntity(3,"里斯","18399990005"));

List<String> courseIds=  users.stream().map(UserEntity::getUserName).collect(Collectors.toList());

}

————————————————

原文链接：https://blog.csdn.net/zhang18330699274/java/article/details/99830428