1. SSK 3101 – LAB 4 Semester 1
2011/2012
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SSK 3101
COMPUTER PROGRAMMING II
LAB 4
NAME : SUGENTIRAN A/L MANE
LECTURER NAME : DR: MOHD TAUFIK ABDULLAH
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2. SSK 3101 – LAB 4 Semester 1
2011/2012
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Fakulti Sains Komputer dan Teknologi Maklumat
SSK3101 (Programming Computer II)
Semester 1 2011/2012
October 21, 2010
Lab 4 (Individual)
Learning Objective:
The objective of this lab is to
1. Construct An Object-oriented Program Using Generic Programming (P4)
Instructions:
1. Date of submission is 28.10.2011 and submits to the lecturer the UML, source program and
the output. Good code development (which uses appropriate selection of variable name,
proper declaration, comments, indentation, and etc.) Your program must be successfully
demonstrates to the demonstrator.
2. Copy or other forms of cheating is forbidden. The faculty has very strong rules about this, and
the penalties may be severe. The standard penalty for the first offence is to award 0 to all
parties concerned.
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3. SSK 3101 – LAB 4 Semester 1
2011/2012
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Question 1 [10M]
We had two inherited classes which are Person and Student from Lab 2 questions. Add class named
Employee. Make Faculty and Staff subclasses of Employee. An employee has an office, salary and
date-hired. Define a class named MyDate that contains the fields year, month and day. A faculty
member has office hours and a rank. A staff member has a title. Override the toString method in
each class to display the class name and the person’s name.
Draw the UML diagram for the classes. Implement the classes. Write a class to test program that
creates a Person, Student, Employee, Faculty and Staff and invokes their toString() methods.
Question 2 [10M]
In class (define on your own, example class name that contain main method can be
TestPolymorphismDemo) that contains main method, construct a method Print(Object O). By
using polymorphism feature, write the code which pass the instances of Person, Student, Employee,
Faculty and Staff to Print(Object O) method which invokes their respective toString() method.
Question 3 [10M]
Extend the Staff class to Admin class and Lecturer class. Lecturer has room_no and subject.
Variable room_no and subject should be declared by using a suitable modifier to restrict its
accessibility within the class itself. The variables can only be achieved by using method getRoom()
and getSubject().
Implement toString() methods in both Admin and Lecturer classes. For Admin class, toString()
method will print out the class name. For Lecturer, toString() method will print out the room_no
and subject. Just assign any random string value to room_no and subject.
Construct a method known as PrintDetails(Object O) in the Staff class. Pass both instances of
Admin and Lecturer to PrintDetails method and invoke their respective toString() method by using
the operator “instanceof” and appropriate casting might be required.
Question 4 [10M]
Rewrite the code in Question 2 without using polymorphism feature by using any programming
method, skill and creativity that you have to achieve the exact same output.
Explain the advantage of using polymorphism feature in the coding.
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4. SSK 3101 – LAB 4 Semester 1
2011/2012
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Question 1
UML:-
Person
+firstName:String
+lastName:String
+streetAddress:String
+zipCode:int
+phoneNumber:int
+Person()
+Person(String,String,String,int,int)
+setFirstName():void
+getFirstName(String)
+setLirstName():void
+getLirstName(String)
+setStreetAddress():void
+getStreetAddress(String)
+setZipCode():void
+getZipCode(int)
+setPhoneNumber():void
+setPhoneNumber(int)
+toString():String
Student
+majorField:String
+gradePointAverage:String
+Student()
+Student(String,String)
+ setMajorField ():void
+get MajorField (String)
+setGradePointAverage ():void
+getGradePointAverage (String)
+toString():String
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5. SSK 3101 – LAB 4 Semester 1
2011/2012
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Employee
+office:String
+date:String MyDate
+salary:double
+year:int
+ Employee() +day:int
+ Employee(String,String,double) +month:String
+setOffice():void
+getOffice(String) + MyDate()
+setSalary():void + MyDate(int,String,int)
+getSalary(double) +toString():String
+setDataHired():void
+getDataHired(String)
+toString():String
Staff
Faculty
+title:String
+officeHours1:String
+officeHours2:String + Staff()
+rank:String + Staff(String)
+setTitle():void
+ Faculty() +getTitle(String)
+ Faculty(int,int,String) +toString():String
+setOfficeHours1():void
+getOfficeHours1(int)
+setOfficeHours2():void
+getOfficeHours2(int)
+setRank():void
+getRank(String)
+toString():String
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6. SSK 3101 – LAB 4 Semester 1
2011/2012
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Coding:-
Class Person
public class Person {
String firstName, lastName, streetAddress;
int zipCode, phoneNumber;
Person(){
}
Person(String firstName,String lastName,String streetAddress,int zipCode,int
phoneNumber){
this.firstName=firstName;
this.lastName=lastName;
this.streetAddress=streetAddress;
this.zipCode=zipCode;
this.phoneNumber=phoneNumber;
}
public void setFirstName(String firstName){
this.firstName=firstName;
}
public String getFirstName(){
return firstName;
}
public void setLastName(String lastName){
this.lastName=lastName;
}
public String getLastName(){
return lastName;
}
public void setStreetAddress(String streetAddress){
this.streetAddress=streetAddress;
}
public String getStreetAddress(){
return streetAddress;
}
public void setZipCode(int zipCode){
this.zipCode=zipCode;
}
public int getZipCode(){
return zipCode;
}
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7. SSK 3101 – LAB 4 Semester 1
2011/2012
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public void setPhoneNumber(int phoneNumber){
this.phoneNumber=phoneNumber;
}
public int getPhoneNumber(){
return phoneNumber;
}
public String toString(){
return "First Name : "+getFirstName()+"nLast Name : "+getLastName()
+"nStreet Addrees : "+getStreetAddress()+"nZip Code : "+getZipCode()
+"nPhone Number : "+getPhoneNumber();
}
}
----------------------------------------------
Class Student
public class Student extends Person{
String majorField,gradePointAverage;
Student(){
}
Student(String majorField, String gradePointAverage){
//super(firstName,lastName,streetAddress,zipCode,phoneNumber);
this.majorField=majorField;
this.gradePointAverage=gradePointAverage;
}
public void setMajorField(String majorField){
this.majorField=majorField;
}
public String getMajorField(){
return majorField;
}
public void setGradePointAverage(String gradePointAverage){
this.gradePointAverage=gradePointAverage;
}
public String getGradePointAverage(){
return gradePointAverage;
}
public String toString(){
return "Major Field : "+getMajorField()+"nGrade Point Average :
"+getGradePointAverage();
}
}
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8. SSK 3101 – LAB 4 Semester 1
2011/2012
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------------------------------------------
Class Employee
public class Employee {
String office,date;
double salary;
Employee(){
}
Employee(String office, double salary, String date){
this.office=office;
this.salary=salary;
this.date=date;
}
public void setOffice(String office){
this.office=office;
}
public String getOffice(){
return office;
}
public void setSalary(double salary){
this.salary=salary;
}
public double getSalary(){
return salary;
}
public void setDateHired(String date){
this.date=date;
}
public String getDateHired(){
return date;
}
public String toString(){
return "Office : "+getOffice()+"nSalary : Rm "+getSalary()+"nDate Hired :
"+getDateHired();
}
}
Class Staff
public class Staff extends Employee{
String title;
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9. SSK 3101 – LAB 4 Semester 1
2011/2012
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Staff(){
}
Staff(String title){
this.title=title;
}
public void setTitle(String title){
this.title=title;
}
public String getTitle(){
return title;
}
public String toString(){
return "Title : "+getTitle();
}
}
---------------------------------------
Class Faculty
public class Faculty extends Employee{
int officeHours1,officeHours2;
String rank;
Faculty(){
}
Faculty(int officeHours1,int officeHours2, String rank){
//super(office,salary,date);
this.officeHours1=officeHours1;
this.officeHours2=officeHours2;
this.rank=rank;
}
public void setOfficeHours1(int officeHours1){
this.officeHours1=officeHours1;
}
public int getOfficeHours1(){
return officeHours1;
}
public void setOfficeHours2(int officeHours2){
this.officeHours2=officeHours2;
}
public int getOfficeHours2(){
return officeHours2;
}
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10. SSK 3101 – LAB 4 Semester 1
2011/2012
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public void setRank(String rank){
this.rank=rank;
}
public String getRank(){
return rank;
}
public String toString(){
return "Office Hours : "+getOfficeHours1()+"am to "+getOfficeHours2()
+"pm"+"nRank : "+getRank();
}
}
---------------------------------------------------
Class MyDate
public class MyDate {
int year,day;
String month;
MyDate(){
}
MyDate(int year,String month,int day){
this.year=year;
this.month=month;
this.day=day;
}
public String toString(){
return "Date Hired : "+day+"/"+month+"/"+year;
}
}
-----------------------------------------------------
Class TestQ1
import java.util.*;
public class TestQ1 {
public static void main(String[] args) {
String ans;
do
{
int a;
Scanner scan=new Scanner(System.in);
System.out.println("Enter 1 for Student and 2 for Staff : ");
a=scan.nextInt();
if(a==1)
{
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11. SSK 3101 – LAB 4 Semester 1
2011/2012
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//Class Person
String first,last,add;
int zip,phone;
System.out.print("First Name :");
first=scan.next();
System.out.print("Last Name : ");
last=scan.next();
System.out.print("Address : ");
add=scan.next();
System.out.print("Zip Code : ");
zip=scan.nextInt();
System.out.print("Phone No : ");
phone=scan.nextInt();
Person person=new Person(first,last,add,zip,phone);
System.out.println("***************************"+"nClass Person");
System.out.println(person.toString());
System.out.println("***************************");
//Class Student
String major,point;
System.out.print("Major Field : ");
major=scan.next();
System.out.print("Grade Point Average : ");
point=scan.next();
Student student=new Student(major,point);
System.out.println("***************************"+"nClass Student");
System.out.println(student.toString());
System.out.println("***************************");
}
else if(a==2)
{
//Class Employee
String office;
double salary;
int day,year;
String month;
System.out.println("Office Name : ");
office=scan.next();
System.out.println("Salary : ");
salary=scan.nextDouble();
System.out.println("Date Hired (mm/dd/yyyy) : ");
System.out.println("Month");
month=scan.next();
System.out.println("Day");
day=scan.nextInt();
System.out.println("Year");
year=scan.nextInt();
MyDate date=new MyDate(year,month,day);
date.toString();
Employee employee=new Employee(office,salary,date.toString());
System.out.println("**************************"+"nClass Employee");
System.out.println(employee.toString());
System.out.println("***************************");
//Class Faculty
int officeHours1,officeHours2;
String rank;
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12. SSK 3101 – LAB 4 Semester 1
2011/2012
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System.out.println("Office Hours : ");
officeHours1=scan.nextInt();
System.out.println("to");
officeHours2=scan.nextInt();
System.out.println("Rank : ");
rank=scan.next();
Faculty faculty=new Faculty(officeHours1,officeHours2,rank);
System.out.println("***************************"+"nClass Faculty");
System.out.println(faculty.toString());
System.out.println("***************************");
//Class Staff
String title;
System.out.println("Title : ");
title=scan.next();
Staff staff=new Staff(title);
System.out.println("***************************"+"nClass Staff");
System.out.println(staff.toString());
System.out.println("***************************");
}
System.out.println("Do it again (Y/N)?");
ans=scan.next();
}while(ans.equalsIgnoreCase("Y"));
}
}
Input:-
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13. SSK 3101 – LAB 4 Semester 1
2011/2012
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Output:-
Question 2:-
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14. SSK 3101 – LAB 4 Semester 1
2011/2012
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import java.util.*;
public class TestPolymorphismDemo {
public static void main(String[] args) {
String ans;
do {
int a;
Scanner scan=new Scanner(System.in);
System.out.println("Enter 1 for Student and 2 for Staff : ");
a=scan.nextInt();
if(a==1){
//Class Person
String first,last,add;
int zip,phone;
System.out.print("First Name :");
first=scan.next();
System.out.print("Last Name : ");
last=scan.next();
System.out.print("Address : ");
add=scan.next();
System.out.print("Zip Code : ");
zip=scan.nextInt();
System.out.print("Phone No : ");
phone=scan.nextInt();
System.out.println("***************************"+"nClass Person");
Print(new Person(first,last,add,zip,phone));
System.out.println("***************************");
//Class Student
String major,point;
System.out.print("Major Field : ");
major=scan.next();
System.out.print("Grade Point Average : ");
point=scan.next();
System.out.println("***************************"+"nClass Student");
Print(new Student(major,point));
System.out.println("***************************");
}
//Class Employee
else if(a==2){
String office;
double salary;
int day,year;
String month;
System.out.println("Office Name : ");
office=scan.next();
System.out.println("Salary : ");
salary=scan.nextDouble();
System.out.println("Date Hired (mm/dd/yyyy) : ");
System.out.println("Month");
month=scan.next();
System.out.println("Day");
day=scan.nextInt();
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15. SSK 3101 – LAB 4 Semester 1
2011/2012
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System.out.println("Year");
year=scan.nextInt();
MyDate date=new MyDate(year,month,day);
date.toString();
System.out.println("**************************"+"nClass Employee");
Print(new Employee(office,salary,date.toString()));
System.out.println("***************************");
//Class Faculty
int officeHours1,officeHours2;
String rank;
System.out.println("Office Hours : ");
officeHours1=scan.nextInt();
System.out.println("to");
officeHours2=scan.nextInt();
System.out.println("Rank : ");
rank=scan.next();
System.out.println("***************************"+"nClass Faculty");
Print(new Faculty(officeHours1,officeHours2,rank));
System.out.println("***************************");
//Class Staff
String title;
System.out.println("Title : ");
title=scan.next();
System.out.println("***************************"+"nClass Staff");
Print(new Staff(title));
System.out.println("***************************");
//Print(new Object());
}
System.out.println("Do it again (Y/N)?");
ans=scan.next();
} while (ans.equalsIgnoreCase("Y"));
}
public static void Print(Object o){
System.out.println(o.toString());
}
}
Input:-
Output:-
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16. SSK 3101 – LAB 4 Semester 1
2011/2012
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Question 3:-
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17. SSK 3101 – LAB 4 Semester 1
2011/2012
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UML:-
Lecturer
Admin
Staff
+roon_no:String
+Admin() +subject:String
+toString():String
PrintDetails():void
+ Lecturer()
+ Lecturer(String,String)
+setRoomNo():void
+getRoomNo(String)
+setSubject():void
+getSubject(String)
+toString():String
Coding:-
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18. SSK 3101 – LAB 4 Semester 1
2011/2012
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Class Admin
public class Admin {
public Admin(){
}
public String toString(){
return "Class Admin";
}
}
-------------------------------------------------
Class Lecturer
public class Lecturer {
String room_no,subject;
public Lecturer(){
}
public Lecturer(String room_no,String subject){
this.room_no=room_no;
this.subject=subject;
}
public void setRoomNo(String newRoom_No){
this.room_no=newRoom_No;
}
public String getRoomNo(){
return room_no;
}
public void setSubject(String newSubject){
this.subject=newSubject;
}
public String getSubject(){
return subject;
}
public String toString(){
return "Room No : "+room_no+"nSubject : "+subject;
}
}
Class Staff
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19. SSK 3101 – LAB 4 Semester 1
2011/2012
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public class Staff {
public static void PrintDetails(Object o){
if (o instanceof Admin){
System.out.println(((Admin)o).toString()+"n***************************");
}
else if (o instanceof Lecturer){
System.out.println(((Lecturer)o).toString()
+"n***************************");
}
}
}
----------------------------------------
Class TestStaff
import java.util.*;
public class TestStaff {
public static void main(String[] args) {
Scanner scan=new Scanner(System.in);
Staff staff=new Staff();
//Class Admin
//Use casting
Object admin=new Admin();
System.out.println("***************************");
staff.PrintDetails(admin);
//Class Lecturer
String room_no,subject;
System.out.print("Room No : ");
room_no=scan.next();
System.out.print("Subject : ");
subject=scan.next();
System.out.println("***************************");
staff.PrintDetails(new Lecturer(room_no,subject));
}
}
Input:-
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20. SSK 3101 – LAB 4 Semester 1
2011/2012
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Output:-
Question 4:-
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21. SSK 3101 – LAB 4 Semester 1
2011/2012
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import java.util.*;
public class TestQ4 {
public static void main(String[] args) {
String ans;
do {
int a;
Scanner scan=new Scanner(System.in);
System.out.println("Enter 1 for Student and 2 for Staff : ");
a=scan.nextInt();
if(a==1){
//Class Person
Person person=new Person();
String first,last,add;
int zip,phone;
System.out.print("First Name :");
first=scan.next();
System.out.print("Last Name : ");
last=scan.next();
System.out.print("Address : ");
add=scan.next();
System.out.print("Zip Code : ");
zip=scan.nextInt();
System.out.print("Phone No : ");
phone=scan.nextInt();
person.setFirstName(first);
person.setLastName(last);
person.setStreetAddress(add);
person.setZipCode(zip);
person.setPhoneNumber(phone);
System.out.println("***************************"+"nClass Person");
System.out.println(person.toString());
System.out.println("***************************");
//Class Student
Student student=new Student();
String major,point;
System.out.print("Major Field : ");
major=scan.next();
System.out.print("Grade Point Average : ");
point=scan.next();
student.setMajorField(major);
student.setGradePointAverage(point);
System.out.println("***************************"+"nClass Student");
System.out.println(student.toString());
System.out.println("***************************");
}
else if(a==2)
{
//Class Employee
Employee employee=new Employee();
String office;
double salary;
int day,year;
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22. SSK 3101 – LAB 4 Semester 1
2011/2012
____________________________________________________________________________
String month;
System.out.println("Office Name : ");
office=scan.next();
System.out.println("Salary : ");
salary=scan.nextDouble();
System.out.println("Date Hired (mm/dd/yyyy) : ");
System.out.println("Month");
month=scan.next();
System.out.println("Day");
day=scan.nextInt();
System.out.println("Year");
year=scan.nextInt();
MyDate date=new MyDate(year,month,day);
date.toString();
employee.setOffice(office);
employee.setSalary(salary);
employee.setDateHired(date.toString());
System.out.println("**************************"+"nClass Employee");
System.out.println(employee.toString());
System.out.println("***************************");
//Class Faculty
Faculty faculty=new Faculty();
int officeHours1,officeHours2;
String rank;
System.out.println("Office Hours : ");
officeHours1=scan.nextInt();
System.out.println("to");
officeHours2=scan.nextInt();
System.out.println("Rank : ");
rank=scan.next();
faculty.setOfficeHours1(officeHours1);
faculty.setOfficeHours2(officeHours2);
faculty.setRank(rank);
System.out.println("***************************"+"nClass Faculty");
System.out.println(faculty.toString());
System.out.println("***************************");
//Class Staff
Staff staff=new Staff();
String title;
System.out.println("Title : ");
title=scan.next();
staff.setTitle(title);
System.out.println("***************************"+"nClass Staff");
System.out.println(staff.toString());
System.out.println("***************************");
//Print(new Object());
}
System.out.println("Do it again (Y/N)?");
ans=scan.next();
} while (ans.equalsIgnoreCase("Y"));
}
}
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23. SSK 3101 – LAB 4 Semester 1
2011/2012
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Input:-
Output:-
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24. SSK 3101 – LAB 4 Semester 1
2011/2012
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25. SSK 3101 – LAB 4 Semester 1
2011/2012
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Kelebihan polymorphism
1. Code that is more dynamic at runtime
2. Code is more flexible and reusable
3. Code re-usability: Using the code written somewhere in program
4. Multiple forms of one object are called in the same way
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