Polymorphism activity

Due Mar $3$ by $11$:$59$pm Points $10$ Submitting a file upload Available Feb $11$ at $1$:$01$pm $-$ Mar $3$ at $11$:$59$pm

Modify the student class to include a private variable for graduation year.

Modify the person class to include a private variable for the birthdate.

Modify the undergraduate class to include a private variable the major.

Modify the polymorphism class to ask the user the following:

How many people?

Read the names?

Ask is the person a student? Read the student ID$.$

if the person is a student, you have to ask : is the person undergraduate student or not? if yes, read the level.

Print out your final people array.

Submit all the modified files

PolymorphismDemo.javaDownload PolymorphismDemo.java

UndergraduateDemo.java Download UndergraduateDemo.java

Undergraduate.java Download Undergraduate.java

Person$-2.$java Download Person$-2.$java

Student$-1.$java Download Student$-1.$java

also what do i do in the undergraduate class? i need that class too to be done