Arrays

[karabo101]

hi guys am trying to edit the main method so that i can create an array of five vehicles(as separate threads). The vehicles should be given IDs ),1,2,3 and 4. now am stuck i need help,pliz highlight edited areas. Thanx in advance. Here is the code i did below.

import java.io.*;

public class Simulate
{
    private static int noOfVehicles = 5;
    private static Vehicle vehicles[];

    public static void main(String[] args) 
    {
       /*int [] VehicleId = new int[5];
       VehicleId[0] = 1;
       VehicleId[1] = 2;
       VehicleId[2] = 3;
       VehicleId[3] = 4;
       VehicleId[4] = 5;
      */

        // Vehicle vehicles[] = new Vehicle();

       Thread t1 = new vehicleId(VehicleId);
       Thread t2 = new vehicleId(VehicleId);    
       Thread t3 = new vehicleId(VehicleId);
       Thread t4 = new vehicleId(VehicleId);
       Thread t5 = new vehicleId(VehicleId);

       t1.start();
       t2.start();
       t3.start();
       t4.start();
       t5.start();

       //System.out.flush(); // make sure all output appears
    }
}

[r035198x]

Stop writing code to do with threads and start by reading Sun's tutorial from the beginning.

[Fubarable]

hi guys am trying to edit the main method so that i can create an array of five vehicles(as separate threads). The vehicles should be given IDs ),1,2,3 and 4. now am stuck i need help,

We'd be glad to help, but I don't see any specific question posted. Exactly how are you stuck?

pliz highlight edited areas.

I'm afraid that this isn't a "fix my code for me, and highlight the changes for me" service. Again, please ask a specific answerable question and we'll be glad to try to help.

Much luck.

[karabo101]

hi all, i want to allow each one of the vehicles according to their ID numbers to enter the toll booth regardless of their order of arrival at the toll booth. Below is my code

package tma01_q3_2009h;
/*
 * Tollbooth.java
 *
 *  
 *
 * Created on 19 May 2009, 13:48
 *
 * M362 CourseTeam.
 */

public class TollBooth
{
    protected int VehicleId;
      protected Vehicle travel;

   public TollBooth() 
   {
    // no data fields
   }
          
   public synchronized void useToll(Vehicle vehicle) throws InterruptedException
   {
               while (vehicle.getVehicleId()==0)
        {
            this.wait();
        }
        int [] VehicleId = new int [5];
        for (int j=0; j < VehicleId.length;j++)
        {
        /* VehicleId[j]=j;*/
       vehicle.travel(50);
       System.out.println("Vehicle" + vehicle.getVehicleId() + " enters toll booth");
       
       System.out.println("Vehicle" + vehicle.getVehicleId() +  " exits toll booth");
             
       this.notifyAll();
   }
            
   }
}

[karabo101]

hi all, i want to allow each one of the vehicles according to their ID numbers to enter the toll booth regardless of their order of arrival at the toll booth. Below is my code

package tma01_q3_2009h;
/*
 * Tollbooth.java
 *
 *  
 *
 * Created on 19 May 2009, 13:48
 *
 * M362 CourseTeam.
 */

public class TollBooth
{
    protected int VehicleId;
      protected Vehicle travel;

   public TollBooth() 
   {
    // no data fields
   }
          
   public synchronized void useToll(Vehicle vehicle) throws InterruptedException
   {
               while (vehicle.getVehicleId()==0)
        {
            this.wait();
        }
        int [] VehicleId = new int [5];
        for (int j=0; j < VehicleId.length;j++)
        {
        /* VehicleId[j]=j;*/
       vehicle.travel(50);
       System.out.println("Vehicle" + vehicle.getVehicleId() + " enters toll booth");
       
       System.out.println("Vehicle" + vehicle.getVehicleId() +  " exits toll booth");
             
       this.notifyAll();
   }
            
   }
}

[pellebye]

{
 i want to allow each one of the vehicles according to their ID numbers to
 enter the toll booth regardless of their order of arrival at the toll booth.
}

Yes, that is what you want ... but what is your problem?

[karabo101]

The problem is vehicle 0 does not enter the tollbooth, it only starts the journey and arrives without entering the tollbooth. other vehicles are ding fine only vehicle 0.

[Fubarable]

The problem is vehicle 0 does not enter the tollbooth, it only starts the journey and arrives without entering the tollbooth. other vehicles are ding fine only vehicle 0.

Well, what do you think this will do when the vehicle id is 0?

   public synchronized void useToll(Vehicle vehicle) throws InterruptedException
   {
        while (vehicle.getVehicleId()==0)
        {
            this.wait();
        }

It's only behaving the way you're telling it to behave.

Also, I've added code tags to your previous posts to make the posted code more readable. I suggest you do the same with future posts. Much luck!

[karabo101]

so what should i do to make it display the output i want? give example

[r035198x]

Read Sun's Java tutorial from the start like I suggested.
Programming is not about shooting in the dark. The behaviors of the while construct and the wait method are all well explained in there.

[karabo101]

yes i hear u, but like i requested give example or show on the code i have provided,that will be very helpful

[r035198x]

You don't need any code snippets to copy and paste. You need to understand the code you already have. You need to understand what

while (vehicle.getVehicleId()==0) {
      this.wait();
}

is doing.

[Fubarable]

Why do you have that wait method that I highlighted? What is its purpose?

You may wish to scrap your current useToll method. Re-write it from the ground up.