java多List集合通过lambda表达式元素相互赋值

java 多List集合通过lambda表达式元素相互赋值

1. demo如下：

import java.io.Serializable;
public class Students implements Serializable{
          
   
	private String name;

    private String score;

    private String lesson;

    public Students() {
          
   
    }

    public Students(String name, String score,String lesson) {
          
   
        this.name = name;
        this.score = score;
        this.lesson = lesson;
    }

    public String getName() {
          
   
        return name;
    }

    public void setName(String name) {
          
   
        this.name = name;
    }

    public String getScore() {
          
   
        return score;
    }

    public void setScore(String score) {
          
   
        this.score = score;
    }

    public String getLesson() {
          
   
        return lesson;
    }

    public void setLesson(String lesson) {
          
   
        this.lesson = lesson;
    }

}

import java.io.Serializable;

public class Teacher implements Serializable {
          
   

    private String name;

    private String score;

    private String lesson;

    public Teacher() {
          
   
    }

    public Teacher(String name, String score, String lesson) {
          
   
        this.name = name;
        this.score = score;
        this.lesson = lesson;
    }

    public String getName() {
          
   
        return name;
    }

    public void setName(String name) {
          
   
        this.name = name;
    }

    public String getScore() {
          
   
        return score;
    }

    public void setScore(String score) {
          
   
        this.score = score;
    }

    public String getLesson() {
          
   
        return lesson;
    }

    public void setLesson(String lesson) {
          
   
        this.lesson = lesson;
    }
}

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class Test1 {
          
   
    public static void main(String[] args) {
          
   
        List<Students> students = new ArrayList<>(3);
        Students students1 = new Students();
        students1.setLesson("语文");
        students1.setName("张三");

        Students students2 = new Students();
        students2.setLesson("数学");
        students2.setName("李四");

        Students students3 = new Students();
        students3.setLesson("英语");
        students3.setName("Jackey");
        students.add(students1);
        students.add(students2);
        students.add(students3);

        List<Teacher> teachers = new ArrayList<>(3);
        Teacher teacher1 = new Teacher();
        teacher1.setScore("34");
        teacher1.setName("吕不韦");
        teacher1.setLesson("语文");

        Teacher teacher2 = new Teacher();
        teacher2.setScore("42");
        teacher2.setName("张三丰");
        teacher2.setLesson("数学");

        Teacher teacher3 = new Teacher();
        teacher3.setScore("56");
        teacher3.setName("欧阳修");
        teacher3.setLesson("英语");

        teachers.add(teacher1);
        teachers.add(teacher2);
        teachers.add(teacher3);

        List<Students> list = students.stream()
                .map(student -> teachers.stream()
                        .filter(teacher -> student.getLesson().equals(teacher.getLesson()))
                        .findFirst()
                        .map(teacher -> {
          
   
                            student.setScore(teacher.getScore());
                            return student;
                        }).orElse(student))
                .collect(Collectors.toList());
        System.out.println(list.toString());
    }
}