Untitled

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

public class MVD {
  public static void main(String[] args) {
    if (args.length != 1) {
      System.out.println("Syntax: java MVD datafile.txt");
      System.exit(0);
    }
    try {
      File file = new File(args[0]);
      Scanner in = new Scanner(file);
      in.nextLine(); // Skip over example line
      char transaction, payment;
      int time;
      String name;
      LinkedList<Person> signin = new LinkedList<Person>();
      LinkedList<Person> renew = new LinkedList<Person>();
      LinkedList<Person> register = new LinkedList<Person>();
      LinkedList<Person> cashier = new LinkedList<Person>();
      while (in.hasNext()) {
        // This populates the main queue completely, which has a 'time' field which simulates various timed entries.
        transaction = (char)in.next().charAt(0);
        payment = (char)in.next().charAt(0);
        time = Integer.parseInt(in.next());
        name = in.nextLine().trim();
        Person signedin = new Person(transaction, payment, time, name);
        signin.add(signedin);
      }
      // Go through each element of each queue until done
      while (signin.size() != 0 && renew.size() != 0 && register.size() != 0 && cashier.size() != 0) {
        // Cycle through those in the sign-in queue
        if (signin.size() != 0) {
          for (int i=0; i<signin.peek().getTimeToWait(); i++) {
            // Do nothing, but simulate waiting -very- fast seconds
          }
          switch (signin.peek().getTransaction()) {
            case 'L':
              signin.peek().setTimeToWait(90);
              renew.add(signin.poll());
              Collections.sort(renew);
              break;
            case 'R':
              signin.peek().setTimeToWait(60);
              register.add(signin.poll());
              break;
          }
        }
        // Cycle through those in the license-renewal queue
        if (renew.size() != 0) {
          for (int i=0; i<renew.peek().getTimeToWait(); i++) {
            // Do nothing, but simulate waiting -very- fast seconds
          }
          renew.peek().setTimeToWait(30);
          cashier.add(renew.poll());
        }
        // Cycle through those in the vehicle-registration queue
        if (register.size() != 0) {
          for (int i=0; i<register.peek().getTimeToWait(); i++) {
            // Do nothing, but simulate waiting -very- fast seconds
          }
          register.peek().setTimeToWait(30);
          cashier.add(register.poll());
        }
        // Cycle through the cashier queue and finish each person
        if (cashier.size() != 0) {
          for (int i=0; i<cashier.peek().getTimeToWait(); i++) {
            // Do nothing, but simulate waiting -very- fast seconds
          }
          if (!cashier.peek().getCheckApproved()) {
            cashier.peek().setTimeToWait(40); // 30+10, right?
            cashier.add(cashier.poll());
          }
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}


import java.util.Random;

public class Person implements Comparable<Person> {
  private char transaction;
  private char payment;
  private int timeToWait;
  private int totalTime;
  private String name;
  
  public Person(char trans, char pay, int timeEntered, String personName) {
    transaction = trans;
    payment = pay;
    timeToWait = timeEntered+10;
    totalTime = timeEntered+10;
    name = personName;
  }
  
  public int getTimeToWait() {
    return timeToWait;
  }
  
  public void setTimeToWait(int time) {
    timeToWait = time;
    totalTime += time;
  }
  
  public int getTotalTime() {
    return totalTime;
  }
  
  public String getName() {
    return name;
  }
  
  public char getTransaction() {
    return transaction;
  }
  
  public char getPayment() {
    return payment;
  }
  
  /**"Decide" whether someone's check is approved or not.
   * @return true if approved, false if not
   */
  public boolean getCheckApproved() {
    Random rand = new Random();
    return (rand.nextInt(1) == 0);
  }
  
  public int compareTo(Person person) {
    return name.compareTo(person.getName());
  }
}