3.13 ( Employee Class) Create a class called Employee that includes three instan

Question

3.13 (Employee Class) 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 con- structor 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 app named Employ- eeTest 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.

Explanation / Answer

/**
* The java program that tests the Employee class
* and its methods and print results to console.
* */
//EmployeeTest.java
public class EmployeeTest {

   public static void main(String[] args) {
      
      
       //Craete two instances of Employee class
       Employee emp1=new Employee("John", "Shek", 12000);
       Employee emp2=new Employee("Mark", "Polo", 10000);
      
       final int NUMBER_OF_MONTHS=12;
      
       //print yearly salary
       System.out.printf("emp1 yearly salary %5.2f ",
               emp1.getMonthlySalary()*NUMBER_OF_MONTHS);
       System.out.printf("emp2 yearly salary %5.2f ",
               emp2.getMonthlySalary()*NUMBER_OF_MONTHS);
      
       //print salary 10 % on monthly salary
       emp1.raiseSalary();
       emp2.raiseSalary();
      
       //print new yearly salary
       System.out.printf("emp1 new yearly salary %5.2f ",
               emp1.getMonthlySalary()*NUMBER_OF_MONTHS);
       System.out.printf("emp2 new yearly salary %5.2f ",
               emp2.getMonthlySalary()*NUMBER_OF_MONTHS);
      
   }
}

--------------------------------------------------------------------------------------------------------

//Employee.java
public class Employee {

   private String firstName;
   private String lastName;
   private double monthlySalary;

  
   //constructor to set class variables
   public Employee(String firstName,String lastName,
           double monthlySalary) {
       this.firstName=firstName;
       this.lastName=lastName;
       this.monthlySalary=monthlySalary;      
   }
   //Setter methods of class instace variables
   public void setFirstName(String firstName){
       this.firstName=firstName;      
   }

   public void setLastName(String lastName){
       this.lastName=lastName;      
   }
  
   public void setMonthlySalary(double monthlySalary){
       this.monthlySalary=monthlySalary;
   }
  
   public void raiseSalary()
   {
       monthlySalary=monthlySalary+monthlySalary+0.10;
   }

   //Getter methods of class instace variables
   public String getFirstName(){
       return firstName;      
   }

   public String getLastName(){
       return lastName;      
   }
  
   public double getMonthlySalary(){
       return monthlySalary;
   }
}//end of Employee class

--------------------------------------------------------------------------------------------------------

Sample Output:

emp1 yearly salary 144000.00
emp2 yearly salary 120000.00
emp1 new yearly salary 288001.20
emp2 new yearly salary 240001.20

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