import java.util.*; class Person { // declare name & birthdate of the person here public Person(String name, String birthdate) { ????????????.. ????????????.. } public String getName() { ???????????. } public String toString() { String result = "Name: " + name; result += "\tBirthdate: " + birthdate; return result; } } class Student extends Person { private String stunum; public Student(String name, String date, String num) { ???????????? ????????????. } public String toString() { String result = super.toString(); result += "\tStudent number: " + stunum; return result; } public String getStudentNumber() { ????????? } } class Undergrad extends Student{ private String program; public Undergrad(String name, String date, String num, String program) { ???????????? ???????????? } public String toString() { String result = "Undergrad:\n" + super.toString(); result += "\tProgram: " + program; return result; } } class Grad extends Student { private String area; public Grad(String name, String date, String num, String area) { ????????????. ????????????? } public String toString() { String result = "Grad:\n" + super.toString(); result += "\tResearch area: " + area; return result; } }
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