java - forEach和RemoveIf一起使用会导致ConcurrentModificationException吗？

Question

我有三门课

 (With getters and Setters)

Student (Class)
   String studentName;
   int sid;
   List<Employee>

Employee (Class)
   String employeeName;
   int eid;
   List<Admin>

Admin (Class)
   String name;
   int adminId;

public class Testing {
public static void main(String arfs[]) {

    Admin admin = new Admin();
    Admin admin2 = new Admin();
    Employee employee = new Employee();
    Student student = new Student();

    List<Admin> adminList = new ArrayList<Admin>();
    List<Employee> empList = new ArrayList<>();

    admin.setName("AdminOne");
    admin.setAdminId(1);
    adminList.add(admin);

    admin2.setName("AdminTwo");
    admin2.setAdminId(2);
    adminList.add(admin2);

    employee.setEmployeeName("employeeOne");
    employee.setEid(4);
    employee.setAdmin(adminList);

    System.out.println("EMPLOYEE: "+employee.getAdmin());

    empList.add(employee);

    student.setStudentName("studentOne");
    student.setSid(9);
    student.setEmployee(empList);

    student.getEmployee().forEach(s -> {
        if(s.getEid()==4) {
            s.getAdmin().removeIf(p -> p.getName().equals("AdminTwo"));
        }
    });

    System.out.println("Student Name: "+student.getStudentName()+" EMP: "+student.getEmployee());


}
}

我得到的输出没有任何异常，但我想知道是否有机会从上面的代码中获取“ConcurrentModificationException”...

当我们迭代一个集合并在其中进行修改时，我们会得到并发修改异常...

Answer 1

使用 forEach 或 enchanced for 不可能得到 ConcurrentModificationException，因为也不可能修改列表。

在您的情况下，您迭代employeeList，但修改adminList。