Create a class called Employee that includes three instance variables-a first na

Question

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. Redo the exercise 3.14 such that you validate the Employee input (firstname, lastname, salary) Implement a Stack class data structure with methods : push(int i), pop(), top(), isempty(), displayinfo(), push(int i) - pushes an item on top of the stack pop()- pops/removes an item from the top of the stack top() - returns the value of the item on top of the stack isempty()- is true if stack is empty, is false otherwise displayinfo() - displays messages if Stack is full, or Stack is empty, or the value on top of the Stack

Explanation / Answer

(a)

Employee Test class:

// Create an Employee class

class Employee {

    // that includes a first name (type String), a last name (type String)

    // and a monthly salary (double) instance variable.

    private String lastName, firstName;

    private doublemonthlySalary;

    // Provide a constructor that initializes the three instance variables.

    public Employee( String lastName, String firstName, doublemonthlySalary ) {

        this.lastName = lastName;

        this.firstName = firstName;

        // note, it doesn't say anything about the non positive rule yet

        // but you appear to believe it's in effect

        // this.monthlySalary = monthlySalary;

        setMonthlySalary(monthlySalary);

    }

     

    //Provide a set and a get method for each instance variable.

    public String getFirstName() { returnfirstName; }

    public String getLastName() { returnlastName; }

    public doublegetMonthlySalary() {return monthlySalary; }

     

    public voidsetFirstName(String s) { firstName = s; }

    public voidsetLastName(String s) { lastName = s; }

    // If the monthly salary is not positive, do not set its value.

    public voidsetMonthlySalary(double v) { if(v>0) { monthlySalary = v; } }

     

    public void display() {

        System.out.printf("Last Name: %s ", getLastName() );

        System.out.printf("First Name: %s ", getFirstName() );

        System.out.printf("Monthly Salary: %.2f ", getMonthlySalary() );

        System.out.printf("Yearly Salary: %.2f ",12.0 * getMonthlySalary() );

        System.out.println();

   }

}

Test Application:

//Write a test application named EmployeeTest that demonstrates class Employee's capabilities.

public class EmployeeTest {

     

   public static voidmain( String[] args ) {

        // Create two Employee objects

        Employee [] emps =new Employee[] {

            new Employee("Nguyen", "Jean", 1111.11),

            new Employee("Kaylor", "Odile", -1313.13 )

        };

        // display each object's yearly salary.

      for(Employee emp : emps) { emp.display(); }

        // Then give each Employee a 10% raise

        for(Employee emp : emps) { emp.setMonthlySalary(emp.getMonthlySalary() * 1.1); }

        // and display each Employee's yearly salary again.

        for(Employee emp : emps) { emp.display(); }

    }

}

// Create an Employee class

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