在spring中创建实体时如何触发setter

我是spring的新手，我在spring.io网站上观看了一个代码如何工作的示例

在下面的代码中如何调用setter，如果类中没有字段

name

，为什么

setName（）setter可以工作


import java.util.Objects;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
class Employee {

    private @Id @GeneratedValue Long id;
    private String firstName;
    private String lastName;
    private String role;

    Employee(String firstName, String lastName, String role) {

        this.firstName = firstName;
        this.lastName = lastName;
        this.role = role;
    }

    public Employee() {

    }

    public String getName() {
        return this.firstName + " " + this.lastName;
    }

    public void setName(String name) {
        String[] parts = name.split(" ");
        this.firstName = parts[0];
        this.lastName = parts[1];
    }

    public Long getId() {
        return this.id;
    }

    public String getFirstName() {
        return this.firstName;
    }

    public String getLastName() {
        return this.lastName;
    }

    public String getRole() {
        return this.role;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public void setRole(String role) {
        this.role = role;
    }

    @Override
    public boolean equals(Object o) {

        if (this == o)
            return true;
        if (!(o instanceof Employee))
            return false;
        Employee employee = (Employee) o;
        return Objects.equals(this.id, employee.id) && Objects.equals(this.firstName, employee.firstName)
                && Objects.equals(this.lastName, employee.lastName) && Objects.equals(this.role, employee.role);
    }

    @Override
    public int hashCode() {
        return Objects.hash(this.id, this.firstName, this.lastName, this.role);
    }

    @Override
    public String toString() {
        return "Employee{" + "id=" + this.id + ", firstName='" + this.firstName + '\'' + ", lastName='" + this.lastName
                + '\'' + ", role='" + this.role + '\'' + '}';
    }
}

控制器

@PostMapping("/employees")
    ResponseEntity<?> newEmployee(@RequestBody Employee newEmployee) {

        EntityModel<Employee> entityModel = assembler.toModel(repository.save(newEmployee));

        return ResponseEntity //
                .created(entityModel.getRequiredLink(IanaLinkRelations.SELF).toUri()) //
                .body(entityModel);
    }

@PostMapping（“/employees”）
ResponseEntity newEmployee（@RequestBody Employee newEmployee）{
EntityModel EntityModel=assembler.toModel（repository.save（newEmployee））；
返回响应性//
.created（entityModel.getRequiredLink（IanaLinkRelations.SELF）.toUri（））//
.主体（实体模型）；
}
为什么
setName（）
setter在什么情况下工作？