is there any guide lines for this problem ?

[Arad Chear]

Project 2
A printer manager program is to manage 10 printers (maximum) available in a local area network. Printer manager receives jobs from the student users. It processes a printing job by sending it to the printer that has smallest number of jobs waiting. Each printer selects print jobs to print in the following order: 1 to 2 page jobs are printed first, 3 to 5 page jobs next, any other sized job according to the time of arrival. Each student is allowed to print a maximum of 100 pages per semester. The printer manager must keep a record of this, and prevents a student who has exceeded his quota, from printing. The printer manager should also enable addition or removal of a printer; removal only if it does not have a print job waiting to be printed.

a. Give a graphical representation of the ADT.
b. Give the specification of various operations/methods of the ADT PrinterManager. The ADT should have at least the following three methods: processJob � to process a print job sent by a student for printing; addPrinter � insert or activate a new printer in the network; and removePrinter � to remove or deactivate a printer in the network. Other than these you will have to specify other supporting methods.
c. Implement the specification as a Java class.
d. Test your PrinterManager implementation by using it in the Main class where static main method reads print requests, requests to add and remove printers from a text file and calls appropriate PrinterManager methods. Assume initially there are 3 printers (ids: 1, 2, 4) active and there are 20 students registered (ids from 1 to 20). After reading the requests from the file and dispatching jobs to printers, the main method should access, each printer through a PrinterManager method, and output the details of the print jobs dispatched to it. It should also print the ids of the students who used their quota.


Please turn over�.

Test Data:
Student 2: print 20 pages
Student 11: print 50 pages
Student 12: print 30 pages
Student 1: print 2 pages
Student 11: print 40 pages
Student 1: print 1 page
Student 2: print 30 pages
Remove printer #2
Student 11: print 20 pages
Student 3: print 2 pages
Student 12: print 70 pages
Student 2: print 20 pages
Add printer #7
Student 6: print 4 pages
Student 7: print 14 pages

The output format:
Printer #1: Print job: Student Id 1: 2 pages
Print job: Student Id 2: 20 pages
�
Printer #2: Print job: Student Id 11: 50 pages
�

i don't want to answer this project , i want only guideline how can i connect student object with printer queue ,

i think maybe in HashMap but the doctor sayed no use for Maps only queues and PriorityQueue , i have try but i stop because i don't know how to link
printer and its jop , like this :
Printer #2: Print job: Student Id 11: 50 pages

i used Comporator in PQueue but it doesn't work , is there any GUIDE LINES for this problem ?

[Stan James]

Ah, I like the Comparator & PriortyQueue idea. What does "didn't work" mean? What did it do that wasn't what you wanted?

[Arad Chear]

i want to make sure my Comparator behaviour is true ,

it print only 1 2

where is 5

this is Student class :

  import java.util.Comparator;
import javaapplication22.Job;
import java.util.PriorityQueue;
public class Student{
  PriorityQueue<Job> jobs =new PriorityQueue<Job>(10,new Sort());
 String name ;
  public Student(String name){
      this.name=name;
  }
 
    public PriorityQueue<Job> getJobs() {
        return jobs;
    }
 
    public String getName() {
        return name;
    }
 
    public void setJobs(PriorityQueue<Job> jobs) {
        this.jobs = jobs;
    }
    public void addJob(Job j){
        jobs.add(j);
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public String toString() {
        String out="";
        for(int i=0;i<jobs.size();i++)
            out+=jobs.poll().toString();
        return out;
         
    }
 
  public static void main(String ... args){
      Student s=new Student("Saad");
        Job j1=new Job(2);
        Job j2=new Job(5);
        Job j3=new Job(1);
        s.addJob(j1);s.addJob(j2);s.addJob(j3);
        System.out.println(s);
    
    
  }
}
 
class Sort implements Comparator<Job>{
    public int compare(Job o1, Job o2) {
     Integer i1=o1.getPages();
     Integer i2=o2.getPages();
     return i1.compareTo(i2);
    }
 
    
}  

and this is Job class :

 package javaapplication22;
public class Job {
   private int pages;
    public Job() {
    }
    public Job(int i){
        pages=i;
    }
 
    public int getPages() {
        return pages;
    }
 
    public void setPages(int pages) {
        this.pages = pages;
    }
 
    public String toString() {
     return " "+pages;
    }
 

}
   

[Arad Chear]

huh ! i solve it

why this work :

     public String toString() {
        String out="";
        for(int i=0;i<jobs.size();i++)
            out+=jobs.poll().toString();
           out+=jobs.poll().toString();
        return out;
         
    }  

and this not

 
  public String toString() {
        String out="";
        for(int i=0;i<=jobs.size();i++)
            out+=jobs.poll().toString();
          
        return out;
         
    }
   

really iam confusing from 5 hours ago and i deal with this problem

[Stan James]

I'm guessing because i is getting bigger and jobs.size() is getting smaller and they cross before you're done. See what while(jobs.size() > 0) does where you have for(...) now.