Hi! hope someone could help me with this one Exercise 9.1 from murach book, crea

Question

Hi! hope someone could help me with this one Exercise 9.1 from murach book, create and work with interfaces,

the codes the gave me are the next ones:

public class DisplayableTestApp
{
public static void main(String args[])
{
System.out.println("Welcome to the Displayable Test application ");

  
public interface DepartmentsConstants
{
int ADMIN = 1;
int EDITORIAL = 2 ;
int MARKETING = 3 ;
}
public interface Displayable
{
getDisplayText();
}
// create an Employee object

// display the employee information

System.out.println();

// create a Product object

// display the product information
}
}

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

public class Employee
{
private int department;
private String firstName;
private String lastName;
private double salary;

public Employee(int department, String lastName, String firstName,
double salary)
{
this.department = department;
this.lastName = lastName;
this.firstName = firstName;
this.salary = salary;
}
}

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

import java.text.NumberFormat;

public class Product
{
private String code;
private String description;
private double price;

public Product()
{
this.code = "";
this.description = "";
this.price = 0;
}

public Product(String code, String description, double price)
{
this.code = code;
this.description = description;
this.price = price;
}

public void setCode(String code)
{
this.code = code;
}

public String getCode(){
return code;
}

public void setDescription(String description)
{
this.description = description;
}

public String getDescription()
{
return description;
}

public void setPrice(double price)
{
this.price = price;
}

public double getPrice()
{
return price;
}

public String getFormattedPrice()
{
NumberFormat currency = NumberFormat.getCurrencyInstance();
return currency.format(price);
}

}

In this aerate, you'll create and implement the interface presented m this charter. You'll also create and implement an interface named Displayable that's similar to the Printable interface.

Explanation / Answer

Interface: Displayable

    public interface Displayable {
        
       String getDisplayText();
    }

Class: Employee

    public class Employee implements DepartmentConstants, Displayable
    {
        private int department;
        private String firstName;
        private String lastName;
        private double salary;
    
        public Employee(int department, String lastName, String firstName,
            double salary)
        {
            this.department = department;
            this.lastName = lastName;
            this.firstName = firstName;
            this.salary = salary;
        }
        
        
        
        public String getDisplayText(){
            
            System.out.println("Test");
             return "Department: " + ADMIN + " "
                    + "FirstName: " + firstName + " "
                    + "LastName: " + lastName + " "
                    + "Salary: " + salary + " ";
    
        }
    }

DisplayableTestApp

    public class DisplayableTestApp
    {
        public static void main(String args[])
        {
            System.out.println("Welcome to the Displayable Test application ");
    
            int department = 1;
            String lastName = "John";
            String firstName = "Mathews";
            double salary = 12345;
            
            // create an Employee object
            Displayable displayable = new Employee (department,lastName,firstName,salary);
            
    
            // display the employee information
            displayable.getDisplayText();
    
            //System.out.println();
        }
    }

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