Java Help: Question 1- In Question1 folder, the EmployeeDemo.java class creates

Question

Java Help:

Question 1- In Question1 folder, the EmployeeDemo.java class creates instances of the PartTimeEmployee.java and FullTimeEmployee.java classes and prints them. Try the code to see that it runs fine; however, the PartTimeEmployee.java and FullTimeEmployee.java classes have a lot of duplicate code.
A: Use Inheritance to reduce code duplication.
1- For this purpose, create a third class called Employee.java, which will contain the code that is in common between PartTimeEmployee.java and FullTimeEmployee.java classes.
2- Modify PartTimeEmployee.java and FullTimeEmployee.java classes, accordingly.
3- Use the concept of abstract classes where it can be applied.
4- Make sure that the Empolyee.java class also has a toString() method and reuse it in the modified PartTimeEmployee.java and FullTimeEmployee.java classes.
5- You should not change the EmployeeDemo.java class to run your modified code.

B: Write a new main method in a class called EmployeeDemo2.java as follows:
1- Create two Employee variables called empPT and empFT. Assign empPT an instance of a PartTimeEmployee and assign empFT to an instance of a FullTimeEmployee objects that you created in part A.
2- Print the both empPT and empFT variables..
3- Specify whether the toString() method of the Employee class is called or the toString() methods of the PartTimeEmployee and FullTimeEmployee classes are called.
4- Explain why the above has happened and in Object Oriented paradigm, what is it called?
5- Call empPT.getHours() in EmployeeDemo2.java.
a. What is the result? Explain why.
b. If there is an error, how can you change empPT to fix the error?

//EmployeeDemo.java

public class EmployeeDemo{

   public static void main(String[] args){
  
       PartTimeEmployee pe1 = new PartTimeEmployee("John", "Driver", 25.0);  
       FullTimeEmployee fe1 = new FullTimeEmployee("Maggie", "Lab Manager", 8000.0);
  
       pe1.setHours(40);
  
       System.out.println(pe1);
       System.out.println(fe1);
  
   }

}

//FullTImeEmployee

public class FullTimeEmployee{

   private String name;
   private String title;
   private double salary;
  
   public FullTimeEmployee(String n, String t, double s){
       name = n;
       title = t;
       salary = s;
   }
  
   public String getName(){
       return name;
   }
  
   public String getTitle(){
       return title;
   }
  
   public double getSalary(){
       return salary;
   }
  
   public String toString(){
       return " Full-time Employee: " + "Name: " + name +
           " Title: " + title +
           " Salary: " + salary;
   }

}

//PartTimeEmployee

public class PartTimeEmployee{

   private String name;
   private String title;
   private double rate;
   private int hours;
  
   public PartTimeEmployee(String n, String t, double r){
       name = n;
       title = t;
       rate = r;
       hours = 0;
   }
  
   public String getName(){
       return name;
   }
  
   public String getTitle(){
       return title;
   }
  
   public void setHours(int h){
       hours = h;
   }
  
   public int getHours(){
       return hours;
   }
  
   public double getSalary(){
       return hours * rate;
   }
  
   public String toString(){
       return " Part-time Employee: " + "Name: " + name +
           " Title: " + title +
           " Salary: " + getSalary();
   }

}

Explanation / Answer

public class PartTimeEmployee{

   private String name;
   private String title;
   private double rate;
   private int hours;

   public PartTimeEmployee(String n, String t, double r){
       name = n;
       title = t;
       rate = r;
       hours = 0;
   }


   public String toString(){
       return " Part-time Employee: " + "Name: " + name +
           " Title: " + title +
           " Salary: " + getSalary();
   }


private String getSalary() {
    // TODO Auto-generated method stub
    return null;
}


public void setHours(int i) {
    // TODO Auto-generated method stub
   
}



}

//FullTImeEmployee

public class FullTimeEmployee{

   private String name;
   private String title;
   private double salary;

   public FullTimeEmployee(String n, String t, double s){
       name = n;
       title = t;
       salary = s;
   }


   public String toString(){
       return " Full-time Employee: " + "Name: " + name +
           " Title: " + title +
           " Salary: " + salary;
   }

}

public class EmployeeDemo{

   public static void main(String[] args){

       PartTimeEmployee pe1 = new PartTimeEmployee("John", "Driver", 25.0);
       FullTimeEmployee fe1 = new FullTimeEmployee("Maggie", "Lab Manager", 8000.0);

       pe1.setHours(40);

       System.out.println(pe1);
       System.out.println(fe1);

   }

}

public class Employee {

    public String getName(){
           return getName();
       }
   
       public String getTitle(){
           return getTitle();
       }
   
       public double getSalary(){
           return getSalary();
       }
      
      
   
   
    public static void main(String[] args) {
        // TODO Auto-generated method stub

    }

}

Related Questions

Navigate

• Browse (All)
• Browse J
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.