create one class named GradeSimulator according to the following instructions:

$1.$ One default constructor.

$2.$ One public void method named addQuizOrAssignment$($double myGrade, double maxGrade$)$ that expects two double arguments. The first representing the grade you receive in the assignment and the other representing maximum grade possible for that assignment.

$3.$ One public void method named addExam$($double myGrade, double maxGrade$)$ that expects two double arguments. The first representing the grade you receive in the exam and the other representing the maximum grade possible for that exam.

$4.$ One public double method named getFinalGrade$()$ that returns a double value that represents the current final grade in the course.

$5.$ Negative input values should be ignored in the methods implementations and not change the final grade.