如何将列表从一项服务复制到另一项（Spring Boot）

Question

我在StudentService中有清单

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")));

我想将一些元素复制到PresentService并添加一个我尝试做的List<Presents> presents = new ArrayList<Student>()但我只有错误

Answer 1

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

该语句不会编译。

您的变量定义要求使用Presents类型的对象，但您给了它一个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());

并在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();
}