Question

Java coding.

Create a class called Printer and a class called Job that will simulate a computer printer. The printer should store a queue of Job objects until they are printed. Each Job should consist of a title and the number of pages the job contains. The printer should also store the number of jobs it can print per minute. The class should include methods to add jobs and print jobs. The method that prints a job should return the amount of time it took to print the job. Create a driver program that processes an input file that contains one of two directions on each line.

The directions are: 1. Add Title # Pages– Add the specified Job to the printer

2. Print n – Print the specified number of jobs

Each instruction is on a separate line and each token of each instruction is separated by a single tab character. Each time a job is printed, determine how long it would take to print the job and keep track of how much time has been spent printing all together. When the whole file has been processed, print a summary that includes the total number of jobs and pages printed and the total amount of time spent printing.

Answer 1

Three classes are used in the solution.

1. Printer class
2. Driver class,
3. PrintJobResponse - this class is used to send print details like job count, time and pages to driver for total

Code Details:

1. Provide full path of the input file in variable fileName in Driver class with input formatted properly as mentioned in the problem
2. Number of jobs Printer can print per min can be configured using jobsPerMin variable in Driver class.
3. Total time is provided in min which can be a float value.

I am also adding a sample input file at the end.

How To Run:

• Import the code in any IDE and then Run the Driver class

Below is the code:

1. Printer Class:

import java.util.LinkedList;
import java.util.List;

public class Printer {
    class Job {
        String title;
        int pages;
        Job(String title, int pages) {
            this.title = title;
            this.pages = pages;
        }
    }

    private List<Job> jobs;
    private int jobsPerMin;

    public Printer(int jobsPerMin) {
        jobs = new LinkedList<>();
        this.jobsPerMin = jobsPerMin;
    }

    public void addJobs(String title, int pages) {
        Job newJob = new Job(title, pages);
        jobs.add(newJob);
    }

    public PrintJobResponse printJobs(int jobCount) {
        if(jobCount > jobs.size())
            jobCount = jobs.size();

        if(jobs.size() == 0) {
            System.out.println("No jobs present.");
            return null;
        }
        int printPages = 0;

        for(int i=0; i<jobCount; i++) {
            Job job = jobs.get(0);
            printPages += job.pages;
            jobs.remove(0);
        }
        return new PrintJobResponse((float) jobCount/jobsPerMin, printPages, jobCount);
    }
}

2. Driver Class:

import java.io.File;
import java.util.Scanner;

public class Driver {
    private static final String ADD = "Add";
    private static final String PRINT = "Print";

    public static void main(String[] args) {
        String fileName = "<fullFilePath>", line, command;
        String[] commandLine;
        int jobsPerMin = 30;
        int totalJobs = 0, totalPages = 0;
        float totalTime = 0;

        try {
            File f = new File(fileName);
            Scanner sc = new Scanner(f);
            Printer printer = new Printer(jobsPerMin);
            PrintJobResponse jobResponse;

            while(sc.hasNextLine()) {
                line = sc.nextLine();
                commandLine = line.split(" ");
                command = commandLine[0];
                switch (command) {
                    case ADD:
                        String title = commandLine[1].trim();
                        int pages = Integer.parseInt(commandLine[3].trim());
                        printer.addJobs(title, pages);
                        break;
                    case PRINT:
                        int printJobs = Integer.parseInt(commandLine[1].trim());
                        jobResponse = printer.printJobs(printJobs);
                        totalJobs += jobResponse.getPrintJobs();
                        totalPages += jobResponse.getPrintPages();
                        totalTime += jobResponse.getPrintTime();
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        System.out.println("Total Jobs: " + totalJobs);
        System.out.println("Total Pages Print: " + totalPages);
        System.out.println("Total Time in Min: " + totalTime);
    }
}

3. PrintJobResponse class:

public class PrintJobResponse {
    private float printTime;
    private int printPages;
    private int printJobs;

    public PrintJobResponse(float printTime, int printPages, int printJobs) {
        this.printTime = printTime;
        this.printPages = printPages;
        this.printJobs = printJobs;
    }

    public float getPrintTime() {
        return printTime;
    }

    public void setPrintTime(float printTime) {
        this.printTime = printTime;
    }

    public int getPrintPages() {
        return printPages;
    }

    public void setPrintPages(int printPages) {
        this.printPages = printPages;
    }

    public int getPrintJobs() {
        return printJobs;
    }

    public void setPrintJobs(int printJobs) {
        this.printJobs = printJobs;
    }
}

4. Sample Input File:

Add Title-1 # 5
Add Title-2 # 3
Add Title-3 # 5
Add Title-4 # 8
Print 3
Print 5
Print 3