Create a class called Employee that includes three instance variables—a first name (type String), a last name (type String) and a monthly salary (double). Provide a constructor that initializes the...

Create a class called Employee that includes three instance variables—a
first name (type String), a last name (type String) and a monthly salary (double). Provide a
constructor that initializes the three instance variables. Provide a set and a get method for each
instance variable. If the monthly salary is not positive, do not set its value. Write a test application
named EmployeeTest that demonstrates class Employee’s capabilities. Create two Employee
objects and display each object’s yearly salary. Then give each Employee a 10% raise and display
each Employee’s yearly salary again.