Build a Java class na

age $($int$)$: representing the age of the student.

Constructors:

A default constructor that constructor that accepts values for all data fields and initializes them accordingly.

Methods:

isAdult$()$: a method that returns true if the student's age is $18$ or above, otherwise returns false.

promote$($String newGrade$)$: a method that updates the grade of the student to the provided newGrade.

getGrade$()$: a method that returns the current grade of the student. provided newGrade.

birthday$()$: a method that increments the age of the student by $1$ to simulate a birthday.

isPassing$()$: a method that checks if the student's grade is passing $($e$.$g$.,$ grade is not $"$F$")$ and returns true if passing, otherwise returns false.

Additionally, create another class named StudentDemo with a main method to demonstrate the functionality of the Student class. In the main method, create instances of the Student class using both constructors, call each method of the Student class to demonstrate their functionality, and print the results.