这个JAVA程序错在哪？

问题出在这里
per[0] = new Student("King", "English");
per[1] = new Student("Queen", "Spanish");
Student 是Do的内部类,所以只有Do的对象才能创建Student.
看看这样的代码:
package ttt;

public class Do {
abstract class Person {
public Person(String s) {
name = s;
}

public abstract String getDescription();

public String GetName() {
return name;
}

private String name;
}

class Student extends Person {
public Student(String m, String n) {
super(m);
major = n;
}

public String getDescription() {
return "a student major in" + major;
}

private String major;
}

public static void main(String[] args) {
Person[] per = new Person[2];
Do d = new Do();
per[0] = d.new Student("King", "English");
per[1] = d.new Stude