Question

Draw a UML diagram for the classes.

Code for UML:

// Date.java

public class Date {
  
   public int month;
   public int day;
   public int year;

   public Date(int month, int day, int year) {
   this.month = month;
   this.day = day;
   this.year = year;
   }
  
   public Date() {
   this.month = 0;
   this.day = 0;
   this.year = 0;
   }
}

//end of Date.java

// Name.java

public class Name {
  
   public String fname;
   public String lname;

   public Name(String fname, String lname) {
   this.fname = fname;
   this.lname = lname;
   }
  
   public Name() {
   this.fname = "";
   this.lname = "";
   }
}

//end of Name.java

// Address.java

public class Address {
  
   public String street ;
   public String state ;
   public String city;
   public int zipcode;

   public Address(String street, String state, String city, int zipcode) {
   this.street = street;
   this.state = state;
   this.city = city;
   this.zipcode = zipcode;
   }
  
   public Address() {
   this.street = "";
   this.state = "";
   this.city = "";
   this.zipcode = 0;
   }
}

//end of Address.java

// Employee.java

public class Employee {
  
   public int number;
   public Date mydate;
   public Address myadress;
   public Name myname;

   public Employee(int number, Name myname, Date mydate, Address myadress) {
   this.number = number;
   this.mydate = mydate;
   this.myadress = myadress;
   this.myname = myname;
   }
  
   public Employee() {
   this.number = 0;
   this.mydate = new Date();
   this.myadress = new Address();
   this.myname = new Name();
   }
  
   // method to display the details of the Employee
   public void display()
   {
       System.out.println("Number: "+number);
       System.out.println("Name: "+myname.fname+" "+myname.lname);
       System.out.println("Data: "+mydate.month+"/"+mydate.day+"/"+mydate.year);
       System.out.println("Address: "+myadress.street+" "+myadress.city+", "+myadress.state+", "+myadress.zipcode);
   }
}
// end of Employee.java

// SalariedEmployee.java

public class SalariedEmployee extends Employee
{
   public double salary;
  
   // parameterized constructor
   public SalariedEmployee(int number, Name myname, Date mydate, Address myadress, double salary)
   {
       super(number, myname, mydate, myadress); // call Employee's constructor
       this.salary = salary;
   }
  
   // default constructor
   public SalariedEmployee()
   {
       super();
       this.salary = 0;
   }
  
   // override Employee's display method to display the additional details
   public void display()
   {
       super.display();
       System.out.printf("Salary: $%,.2f\n",salary);
   }
}
//end of SalariedEmployee.java

// HourlyEmployee.java

public class HourlyEmployee extends Employee
{
   public double pay_rate;
   public int hours_worked;
   public double earnings;
  
   // parameterized constructor
   public HourlyEmployee(int number, Name myname, Date mydate, Address myadress, double pay_rate, int hours_worked)
   {
       super(number, myname, mydate, myadress);
       this.pay_rate = pay_rate;
       this.hours_worked = hours_worked;
       // calculate earnings
       if(hours_worked <= 40) // no overtime
           earnings = this.pay_rate*this.hours_worked;
       else // overtime
           earnings = this.pay_rate*40 + (this.hours_worked-40)*1.5*this.pay_rate;
   }
  
   // default constructor
   public HourlyEmployee()
   {
       super();
       pay_rate = 0;
       hours_worked = 0;
       earnings = 0;
   }
  
   // override display method
   public void display()
   {
       super.display();
       System.out.printf("Pay rate: $%,.2f\n",pay_rate);
       System.out.println("Hours Worked: "+hours_worked);
       System.out.printf("Earnings: $%,.2f\n",earnings);
   }
}
//end of HourlyEmployee.java

// Employeeinfo.java

public class Employeeinfo {
  
   public static void main(String[] args)
   {
       // create SalariedEmployee
       SalariedEmployee s = new SalariedEmployee(12, new Name("Shaun","Marsh"), new Date(11, 7, 1995), new Address("Street1","State1","City1",70081), 75000);

       // create HourlyEmployee without any overtime
       HourlyEmployee h1 = new HourlyEmployee(15, new Name("Harry","Doe"), new Date(7, 16, 2000), new Address("Street2","State2","City2",60181), 45.75, 35);

       // create HourlyEmployee with overtime
       HourlyEmployee h2 = new HourlyEmployee(25, new Name("Jerry","Hope"), new Date(10, 16, 2007), new Address("Street3","State3","City3",80111), 45.75, 45);
      
       // display the details
       s.display();
       System.out.println();
       h1.display();
       System.out.println();
       h2.display();
   }

}

//end of Employeeinfo.java

Answer 1

Step 1:Date, Address, and Name are used as attributes in Employee, we introduce a dependency relationship

Step 2:Since there is a parent /Child relationship between Employee(Parent) and SalariedEmployee(Child) and HoulrlyEmployee(Child) we introduce the Generalization relationship.

Step 3:Since we are using SalariedEmployee and HourlyEmployee in Employeeinfo we introduce a dependency relationship.

The UML Class Diagram is :