I just need the undergraduate and gradute classes, java code.

Activity Description:

Suppose we are designing a college record$-$keeping program that has records for students and faculty. There is a natural hierarchy for grouping these record types:

They are all records of people.

Students. The student has the ability to start from the beginning $($reset$)$ at any point, i$.$e$.,$ a student in $3$rd year can start from the beginning with the same major or a different one. We have two kinds of students:

Undergraduate Students. Undergraduate students have the following properties:

Name, StudentNumber, Major, and Level $($freshman$,$ sophomore, junior, senior$)$

Graduate Students. Graduate students have the following properties:

Name, StudentNumber, Major, and Degree $($Master$,$ Doctoral$)$

Instructors. Instructors have the following properties:

Name, ID$,$ Salary. However, the salary is a property in the job class