如何将List从一个服务复制到另一个服务（Spring Boot）

Question

我在StudentService中有List

private List<Student> students = new ArrayList<>(Arrays.asList( new Student("1", "Lukasz", "Nowak", "Cicha 3", "1a"), new Student("2", "Tomasz", "Tomczyk", "Krakowska 13a", "1a"), new Student("3", "Grzegorz", "Adamiak", "Podkarpacka 8", "2b"), new Student("4", "Klaudia", "Kurcz", "Warszawska 13", "2b")));

我希望将一些元素复制到PresentService并添加一个礼物 我试着这样做 List<Presents> presents = new ArrayList<Student>() 但我只得到错误

Answer 1

List<Presents> presents = new ArrayList<Student>()

此声明无法编译。

您的变量定义期望Presents类型的对象，但您给它一个Student列表。

最简单的解决方案是

List<Presents> presents = students.stream().map((student) -> new Present(student)).collect(Collectors.toList());

在Presents类

中创建一个构造函数

public Presents(Student student) {
   //Create your present object as you would want to here
   //For example if you wanted name
   this.name = student.getName();
}