Exception in thread "main" java.util.NoSuchElementException

Code:

---

public class Animal
{
  protected int id;
  protected String type;
  protected double mass;
 
    //------------------------------------------------------------------------
    //  Sets up an animal with the specified ID number, type and weight.
    //------------------------------------------------------------------------
 
  public Animal (int animalID, String animalType, double weight)
  {
      id = animalID;
      type = animalType;
      mass = weight;
  }
 
  //------------------------------------------------------------------------
  //  Returns information about this animal as a string.
  //------------------------------------------------------------------------
 
  public String toString()
  {
      String description = "ID: " + id + "\n";
 
      description += "Type: " + type + "\n";
      description += "Weight: " + mass + "\n";
 
      return description; 
  }
}

---

Code:

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public class Pet extends Animal
{
  private String title;
  private String own;
 
  //------------------------------------------------------------------------
  //  Sets up a pet using the specified information.
  //------------------------------------------------------------------------
 
  public Pet (int animalID, String animalType, double weight, String name, String owner)
  {
      super (animalID, animalType, weight);
 
      title = name;
      own = owner;
  }
 
  //------------------------------------------------------------------------
  //  Returns information about this pet as a string.
  //------------------------------------------------------------------------
 
  public String toString()
  {
      String description = super.toString();
 
      description += "Name: " + title + "\n";
      description += "Owner: " + own + "\n";
 
      return description; 
  }
}

---

Code:

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public class ZooAnimal extends Animal
{
  private int cage;
  private String train;
 
  //------------------------------------------------------------------------
  //  Sets up a zoo animal using the specified information.
  //------------------------------------------------------------------------
 
  public ZooAnimal (int animalID, String animalType, double weight, int cageNumber, String trainer)
  {
      super (animalID, animalType, weight);
 
      cage = cageNumber;
      train = trainer;
  }
 
  //------------------------------------------------------------------------
  //  Returns information about this zoo animal as a string.
  //------------------------------------------------------------------------
 
  public String toString()
  {
      String description = super.toString();
 
      description += "Cage: " + cage + "\n";
      description += "Trainer: " + train + "\n";
 
      return description;
  }
}

---

Code:

---

import java.util.Scanner;
import java.util.StringTokenizer;
import java.io.*;

public class FileRead
{

  public static void main (String[] args) throws FileNotFoundException
  {
      Scanner scan = new Scanner(new File("animal.txt"));
      String animalType = null, name = null, trainer = null, owner = null, lineIn = null;
      int animalID = 0, cageNumber = 0;
      double weight = 0.0;
      StringTokenizer st = null;
      Animal animal = null;
      Pet pet = null;
      ZooAnimal zooAnimal = null;

      while (scan.hasNextLine())
      {
        lineIn = scan.nextLine();
        st = new StringTokenizer(lineIn, ",");
        animalID = Integer.parseInt(st.nextToken());
        name = st.nextToken();

        if (!st.hasMoreTokens())
        {
            animal = new Animal (animalID, animalType, weight);
            System.out.println(animal);
        }
        else
        {
            name = st.nextToken();
            owner = st.nextToken();
            pet = new Pet(animalID, animalType, weight, name, owner);
            System.out.println(pet);
        }
        if (!st.hasMoreTokens())
        {
            cageNumber = Integer.parseInt(st.nextToken());
            trainer = st.nextToken();
            zooAnimal = new ZooAnimal(animalID, animalType, weight, cageNumber, trainer);
            System.out.println(zooAnimal);
            System.out.println();
        }
      }
  }
}

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The following code segment is animal.txt

Code:

---

3000,Monkey,38.6
7999,Ape,65.2,
8000,Dog,13.4,Thomas,George,
5252,Giraffe,130.3,103,Samuel,

---

Here is my desired output:

ID: 3000
Type: Monkey
Weight: 38.6

ID: 7999
Type: Ape
Weight: 65.2

(The above from the animal class)

ID: 8000
Type: Dog
Weight: 13.4
Name: Thomas
Owner: George

(The above from the pet class)

ID: 5252
Type: Giraffe
Weight: 130.3
Cage Number: 103
Trainer: Samuel

(The above from the zoo animal class)

The error that's throwing me off so far is:

Exception in thread "main" java.util.NoSuchElementException
at java.util.StringTokenizer.nextToken(StringTokenize r.java:332)
at FileRead.main(FileRead.java:42)

What am I doing wrong that's preventing me from my program printing the output?

You may wish to use some System.out.println statements to test the state of the program and to see what is going wrong. For instance, one great place to place one is here:

Code:

---

      while (scan.hasNextLine())
      {
        lineIn = scan.nextLine();
        [color="red"][b]System.out.println("lineIn: " + lineIn);[/b][/color] // add System.out.println here!
        st = new StringTokenizer(lineIn, ",");
        animalID = Integer.parseInt(st.nextToken());
        name = st.nextToken();

---

You don't grab the weight afer you get the type of animal (which you assign to "name" by the way, not animalType).
This means the if() is always false, since there is always another token.
This results in the code grabbing the animals name, and then the owners name...but for the first few animals you only have a weight...so you get your exception.

your input-file is wrong, i correct it to

Code:

---

3000,Monkey,38.6
7999,Ape,65.2,
8000,Dog,13.4,Thomas,George,
5252,Giraffe,130.3,Girafy,Samuel,

---

so that the name for Giraffe is Girafy and the trainer is Samuel. and the FileRead contained few errors. when you readed the second parameter in the file as name and not as type and so on ... but now the class loook like

Code:

---

import java.util.Scanner;
import java.util.StringTokenizer;
import java.io.*;

public class FileRead
{

  public static void main (String[] args) throws FileNotFoundException
  {
      Scanner scan = new Scanner(new File("D:/Documents and Settings/t120468/temp/animal.txt"));
      String animalType = null, name = null, trainer = null, owner = null, lineIn = null;
      int animalID = 0, cageNumber = 0;
      double weight = 0.0;
      StringTokenizer st = null;
      Animal animal = null;
      Pet pet = null;
      ZooAnimal zooAnimal = null;

      while (scan.hasNextLine())
      {
        lineIn = scan.nextLine();
        st = new StringTokenizer(lineIn, ",");
        animalID = Integer.parseInt(st.nextToken());
        animalType = st.nextToken();
        weight = Double.valueOf(st.nextToken());

        if (!st.hasMoreTokens())
        {
            animal = new Animal (animalID, animalType, weight);
            System.out.println(animal);
        }
        else
        {
            name = st.nextToken();
            owner = st.nextToken();
            pet = new Pet(animalID, animalType, weight, name, owner);
            System.out.println(pet);
        }
        if (st.hasMoreTokens())
        {
            cageNumber = Integer.parseInt(st.nextToken());
            trainer = st.nextToken();
            zooAnimal = new ZooAnimal(animalID, animalType, weight, cageNumber, trainer);
            System.out.println(zooAnimal);
            System.out.println();
        }
      }
  }
}

---

and produce

Code:

---

ID: 3000
Type: Monkey
Weight: 38.6

ID: 7999
Type: Ape
Weight: 65.2

ID: 8000
Type: Dog
Weight: 13.4
Name: Thomas
Owner: George

ID: 5252
Type: Giraffe
Weight: 130.3
Name: Girafy
Owner: Samuel

---

it's ok?

Thank you j2me64, that helped me out a great deal.