找出下面代码中存在的错误。 public class Test { public static void main(Stringargs) { m(new GraduateStudent()); m(new Student()); m(new Person()); m(new Object()); } public static void m(Student x) { System.out.println(x.toString()); } } class GraduateStudent extends Student { } class Student extends Person { @Override public String toString() { return "Student"; } } class Person extends Object { @Override public String toString() { return "Person"; } }
选项:
A:m(new Student()) ,产生错误
B:m(new GraduateStudent()),产生错误
C:m(new Object()) ,产生错误
D:m(new Person()) ,产生错误
发布时间:2024-03-31 20:33:18