in java

Step $1$: Person

$1.$ Write a class called Person $($this class cannot be instantiated$).$ Now add the following fields and mark them private:

firstName, lastName $($String$)$

age $($int$)$

$2.$ Add a constructor that takes the first and last name and age as parameters and initializes the fields above.

$3.$ Add an abstract method, goAboutDay, that takes no parameters and returns nothing $($void$)$

$4.$ Add a toString that renders the Person like so:

Person: $[$firstName$],[$lastName$]-$ age: $[$age$]$

Step $2$: ISalaried

Create an interface, ISalaried, that exports a single abstract method: getSalary$()$ with a return type of double.

Step $3$: Student

$1.$ Now write a Student class $($this class can be able to be instantiated$).$ Make the class extend Person.

$2.$ Add a constructor that takes the same parameters as Person and super them up via a super$(..)$ call in the constructor.

$3.$ Override the goAboutDay$()$ method and make it print: "studying, class, beer, bed"

Step $4$: GraduateStudent

$1.$ Create a class GraduateStudent that can be instantiated. Make the class extend Student.

$2.$ Make the constructor accept a first name, last name, an age, and a list of courses $($of type List$)$ store the courses into a field and super up the rest to the student class constructor.

$3.$ Now make this class implement ISalaried.

when you go implement the getSalary$()$ method required by the interface, the implementation for should return $$10\mathrm{.}00$ if they are teaching $15$ or more courses, $$0$ otherwise.

$4.$ Override the goAboutDay$()$ method and have it print: "bed, writing, reading, teaching, class"

Step $5$: Instructor

$1.$ Create an instructor class that extends Person and implements Salaried. This class should be able to be instantiated.

$2.$ Add two private fields:

yearlySalary $($type: double$)$

activeCourses $($type: List$)$

$3.$ Add a constructor that matches the superclass constructor and adds parameters for the yearlySalary and List containing the courses being actively taught by the instructor. Initialize the two fields above using these parameters.

$4.$ Override the getSalary$()$ method. If the activeCourses list is empty, make the method return $$0$; otherwise make it return yearlySalary.

$5.$ Override the goAboutDay$()$ method and make it print: "teaching, grading, tv$,$ bed"

Step $6$: Tester

Create a Tester class with a main$(..)$ method. Instantiate a GraduateStudent and an Instructor $($make the declared type for these variables ISalaried$).$ Print out each variables salary by calling the getSalary$()$ method.