Question

Can anyone identify which OO Design Patterns are being used in the following code?:

package mis;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;

class helpDeskGuidline{
   private void setGuideLine(){
      
   }
   public void rateService(){
      
   }
}
public class HelpDeskService extends helpDeskGuidline{ //HelpDeskService class extends helpDeskGuidline this
   //called inheritance

   private static int ticketId=1;
   Ticket ticket; // HelpDeskService class using ticket class object. this is has-A relationship (aggregation)
  
  
   ArrayList<Ticket> allTicket=new ArrayList<>();
   HashMap<Ticket,Person> ticketAllocation=new HashMap<>();
   HashMap<Person,Integer> assignee=new HashMap<>();
   HelpDeskService(){
       Person p=new Person();
       p.setJobTitle("IT Con");
       p.setName("Jhon");
       p.setPhone("678");
       p.setRole("lead");
       assignee.put(p,0);
       p=new Person();
           p.setJobTitle("software Con");
           p.setName("joe");
           p.setPhone("676548");
           p.setRole("Ninja");
           assignee.put(p,1);
      
   }
   public int raiseTicket(String desc,String name){
       boolean set=false;
       ticket=new Ticket();
       ticket.setDesc(desc);
       ticket.setTicketId(ticketId++);
      
       ticket.setAssignedBy(name); //this class using ticket class's object without knowing
       //it's Complexity this is called abstractor
       Iterator<Entry<Person, Integer>> it = assignee.entrySet().iterator();
   while (it.hasNext()) {
   Map.Entry<Person,Integer> pair = (Map.Entry)it.next();
   if(pair.getValue()==0){
       ticket.setAssignedTo(pair.getKey().getName());
       ticket.setStatus("open");
       set=true;
       break;
   }
  
   }
   if(!set)
       ticket.setStatus("hold");
   allTicket.add(ticket);
   return ticket.getTicketId();
   }
   //two methods have same name but different parameters this concept is called method overloading (compile time
   //polymorphism)   
  
   public void seeTickets(){
       System.out.println("-------------------List of all Ticket----------------");
       for(Ticket tickets:allTicket){
           System.out.println(tickets);
       }
   }
   public void seeTickets(int id){
       System.out.println("------------------- Ticket Desc of Id:"+id+" ----------------");
      
           System.out.println(allTicket.get(id));
      
   }
   //this function is being overridden from parent class . this called method overriding ( runtime
   //polymorphism)   
   public void rateService(){
      
   }
   public static void main(String[] args) {
       HelpDeskService helpDeskService=new HelpDeskService();
       Scanner sc=new Scanner(System.in);
       System.out.print("Please enter what's your problem:");
       String desc=sc.nextLine ();
       System.out.print("What's your name:");
       String name=sc.nextLine ();
       int t=helpDeskService.raiseTicket(desc, name);
       System.out.println("Your request has been recorded. Here is your ticket ID: "+t);
       helpDeskService.seeTickets();
   }

}

//Here separate class has been used to store different type of data. this IS called encapsulation

//class to store ticket info
class Ticket{
   int ticketId;
   String status;
   String assignedBy;
   String assignedTo;
   String desc;
   public String toString(){
       return "Ticket Id : "+ticketId+"\n"+
   "status: "+status+"\n"+
   "AssignedBy : "+assignedBy+"\n"+
   "Assigned To: "+assignedTo+"\n"+
   "desc : "+desc+"\n";
              
   }
   public String getDesc() {
       return desc;
   }
   public void setDesc(String desc) {
       this.desc = desc;
   }
   public int getTicketId() {
       return ticketId;
   }
   public void setTicketId(int ticketId) {
       this.ticketId = ticketId;
   }
   public String getStatus() {
       return status;
   }
   public void setStatus(String status) {
       this.status = status;
   }
   public String getAssignedBy() {
       return assignedBy;
   }
   public void setAssignedBy(String assignedBy) {
       this.assignedBy = assignedBy;
   }
   public String getAssignedTo() {
       return assignedTo;
   }
   public void setAssignedTo(String assignedTo) {
       this.assignedTo = assignedTo;
   }
  
  
}
//person class to store assigners and assignee info
class Person{
   String name;
   String role;
   String phone;
   String jobTitle;
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getRole() {
       return role;
   }
   public void setRole(String role) {
       this.role = role;
   }
   public String getPhone() {
       return phone;
   }
   public void setPhone(String phone) {
       this.phone = phone;
   }
   public String getJobTitle() {
       return jobTitle;
   }
   public void setJobTitle(String jobTitle) {
       this.jobTitle = jobTitle;
   }
  
}

output

Please enter what's your problem:key board is not working
What's your name:jon
Your request has been recorded. Here is your ticket ID: 1
-------------------List of all Ticket----------------
Ticket Id : 1
status: open
AssignedBy : jon
Assigned To: Jhon
desc : key board is not working

Answer 1

here is the answer......

1.Creational Design Pattern

1. Factory Pattern
2. Abstract Factory Pattern
3. Singleton Pattern
4. Prototype Pattern
5. Builder Pattern.

2. Structural Design Pattern

1. Adapter Pattern
2. Bridge Pattern
3. Composite Pattern
4. Decorator Pattern
5. Facade Pattern
6. Flyweight Pattern
7. Proxy Pattern

3. Behavioral Design Pattern

1. Chain Of Responsibility Pattern
2. Command Pattern
3. Interpreter Pattern
4. Iterator Pattern
5. Mediator Pattern
6. Memento Pattern
7. Observer Pattern
8. State Pattern
9. Strategy Pattern
10. Template Pattern
11. Visitor Pattern

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;

class helpDeskGuidline{
   private void setGuideLine(){
      
   }
   public void rateService(){
      
   }
}
public class HelpDeskService extends helpDeskGuidline{ //HelpDeskService class extends helpDeskGuidline this
   //called inheritance

   private static int ticketId=1;
   Ticket ticket; // HelpDeskService class using ticket class object. this is has-A relationship (aggregation)
  
  
   ArrayList<Ticket> allTicket=new ArrayList<>();
   HashMap<Ticket,Person> ticketAllocation=new HashMap<>();
   HashMap<Person,Integer> assignee=new HashMap<>();
   HelpDeskService(){
       Person p=new Person();
       p.setJobTitle("IT Con");
       p.setName("Jhon");
       p.setPhone("678");
       p.setRole("lead");
       assignee.put(p,0);
       p=new Person();
           p.setJobTitle("software Con");
           p.setName("joe");
           p.setPhone("676548");
           p.setRole("Ninja");
           assignee.put(p,1);
      
   }
   public int raiseTicket(String desc,String name){
       boolean set=false;
       ticket=new Ticket();
       ticket.setDesc(desc);
       ticket.setTicketId(ticketId++);
      
       ticket.setAssignedBy(name); //this class using ticket class's object without knowing
       //it's Complexity this is called abstractor
       Iterator<Entry<Person, Integer>> it = assignee.entrySet().iterator();
   while (it.hasNext()) {
   Map.Entry<Person,Integer> pair = (Map.Entry)it.next();
   if(pair.getValue()==0){
       ticket.setAssignedTo(pair.getKey().getName());
       ticket.setStatus("open");
       set=true;
       break;
   }
  
   }
   if(!set)
       ticket.setStatus("hold");
   allTicket.add(ticket);
   return ticket.getTicketId();
   }
   //two methods have same name but different parameters this concept is called method overloading (compile time
   //polymorphism)   
  
   public void seeTickets(){
       System.out.println("-------------------List of all Ticket----------------");
       for(Ticket tickets:allTicket){
           System.out.println(tickets);
       }
   }
   public void seeTickets(int id){
       System.out.println("------------------- Ticket Desc of Id:"+id+" ----------------");
      
           System.out.println(allTicket.get(id));
      
   }
   //this function is being overridden from parent class . this called method overriding ( runtime
   //polymorphism)   
   public void rateService(){
      
   }
   public static void main(String[] args) {
       HelpDeskService helpDeskService=new HelpDeskService();
       Scanner sc=new Scanner(System.in);
       System.out.print("Please enter what's your problem:");
       String desc=sc.nextLine ();
       System.out.print("What's your name:");
       String name=sc.nextLine ();
       int t=helpDeskService.raiseTicket(desc, name);
       System.out.println("Your request has been recorded. Here is your ticket ID: "+t);
       helpDeskService.seeTickets();
   }

}

//Here separate class has been used to store different type of data. this IS called encapsulation

//class to store ticket info
class Ticket{
   int ticketId;
   String status;
   String assignedBy;
   String assignedTo;
   String desc;
   public String toString(){
       return "Ticket Id : "+ticketId+"\n"+
   "status: "+status+"\n"+
   "AssignedBy : "+assignedBy+"\n"+
   "Assigned To: "+assignedTo+"\n"+
   "desc : "+desc+"\n";
              
   }
   public String getDesc() {
       return desc;
   }
   public void setDesc(String desc) {
       this.desc = desc;
   }
   public int getTicketId() {
       return ticketId;
   }
   public void setTicketId(int ticketId) {
       this.ticketId = ticketId;
   }
   public String getStatus() {
       return status;
   }
   public void setStatus(String status) {
       this.status = status;
   }
   public String getAssignedBy() {
       return assignedBy;
   }
   public void setAssignedBy(String assignedBy) {
       this.assignedBy = assignedBy;
   }
   public String getAssignedTo() {
       return assignedTo;
   }
   public void setAssignedTo(String assignedTo) {
       this.assignedTo = assignedTo;
   }
  
  
}
//person class to store assigners and assignee info
class Person{
   String name;
   String role;
   String phone;
   String jobTitle;
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getRole() {
       return role;
   }
   public void setRole(String role) {
       this.role = role;
   }
   public String getPhone() {
       return phone;
   }
   public void setPhone(String phone) {
       this.phone = phone;
   }
   public String getJobTitle() {
       return jobTitle;
   }
   public void setJobTitle(String jobTitle) {
       this.jobTitle = jobTitle;
   }
  
}

output

Please enter what's your problem:key board is not working
What's your name:jon
Your request has been recorded. Here is your ticket ID: 1
-------------------List of all Ticket----------------
Ticket Id : 1
status: open
AssignedBy : jon
Assigned To: Jhon
desc : key board is not working