HELP Error Parsing File

**gerry123** · July 20th, 2011, 03:45 PM

Hi there I have a few error messages coming up with my code, if someone could point me in the right direction

regards

gerry

package supermarketproject;
 
public class LinkedQueue<T> implements QueueADT<T>
{
   private int count;
   private LinearNode<T> front, rear;
 
   /**
    * Creates an empty queue.
    */
   public LinkedQueue()
   {
      count = 0;
      front = rear = null;
   }
 
    public boolean isEmpty( ) {
        return front == null;
    }
 /**
    * Adds the specified element to the rear of this queue.
    *
    * @param element  the element to be added to the rear of this queue
    */
   public void enqueue (T element)
   {
      LinearNode<T> node = new LinearNode<T>(element);
 
      if (isEmpty())
         front = node;
      else
         rear.setNext (node);
 
      rear = node;
      count++;
   }
 
   public T dequeue() throws EmptyCollectionException
   {
      if (isEmpty())
         throw new EmptyCollectionException ("queue");
 
      T result = front.getElement();
      front = front.getNext();
      count--;
 
      if (isEmpty())
         rear = null;
 
      return result;
   }
 
   /**
    * Sets up this exception with an appropriate message.
    */
 public ElementNotFoundException (String collection)
   {
      super ("The target element is not in this " + collection);
   }
}
/**
 * EmptyCollectionException represents the situation in which a collection
 * is empty.
 */
 
public class EmptyCollectionException extends RuntimeException
{
   /**
    * Sets up this exception with an appropriate message.
    */
   public EmptyCollectionException (String collection)
   {
      super ("The " + collection + " is empty.");
   }
}
}

**Norm** · July 20th, 2011, 04:07 PM

I have a few error messages

Sorry, I don't see your error messages???

Please edit your code and wrap it in code tags. See:BB Code List - Java Programming Forums

**gerry123** · July 20th, 2011, 04:15 PM

Originally Posted by Norm

Sorry, I don't see your error messages???

Please edit your code and wrap it in code tags. See:BB Code List - Java Programming Forums

As you can see i have put the code in question in bold

regards

gerry

**Norm** · July 20th, 2011, 04:28 PM

Can you explain what the problem is with that code?

You said:

I have a few error messages coming up with my code

Please copy and paste the full text of those error messages here.

**gerry123** · July 20th, 2011, 05:04 PM

i have underlined the error messages in question

regards

gerry

public ElementNotFoundException (String collection) invalid method declaration; return type required{
super ("The target element is not in this " + collection); constructor Object in java.lang.Object cannot be applied to given types; required: no arguments, found: java.lang.String, reason: actual and formal argument lists different in length. call to super must be first statement in constructor}
}
/**
* EmptyCollectionException represents the situation in which a collection
* is empty.
*/

public class EmptyCollectionException extends RuntimeException classEmptyCollectionException is public, should be declared in a file named EmptyCollectionException.java
{
/**
* Sets up this exception with an appropriate message.
*/
public EmptyCollectionException (String collection)
{
super ("The " + collection + " is empty.");
}
}
} class, interface, or enum expected

**Norm** · July 20th, 2011, 05:13 PM

That is a very confusing post. Why are the error messages mixed in with the source code?

public ElementNotFoundException (String collection) invalid method declaration; return type required

The code looks like a constructor (no return type) but the compiler thinks it is a method definition.
Check the placement of the code.
Which is it? A method or a constructor? Where is the class statement for it?

public class EmptyCollectionException extends RuntimeException classEmptyCollectionException is public, should be declared in a file named EmptyCollectionException.java

That message is self explanatory. Move the class to its own named file.

**gerry123** · July 20th, 2011, 05:24 PM

the error messages are not mixed in with the source code, i typed the underlined text out manually to show u what the errors were

regards

**Norm** · July 20th, 2011, 05:28 PM

It be better to just post the error messages without any editing.

Or to leave a blank line between the source and the error message.

**JavaPF** · July 21st, 2011, 03:30 AM

I must say this thread is rather confusing.

gerry123, the code or highlight tags are used to keep the code neat and add syntax highlighting which both make it easier to read.

You also need to post all your code and give us something we can attempt to compile.

**gerry123** · July 21st, 2011, 11:57 AM

package supermarketproject;
 
public class LinkedQueue<T> implements QueueADT<T>
{
   private int count;
   private LinearNode<T> front, rear;
 
   /**
    * Creates an empty queue.
    */
   public LinkedQueue()
   {
      count = 0;
      front = rear = null;
   }
 
    public boolean isEmpty( ) {
        return front == null;
    }
 /**
    * Adds the specified element to the rear of this queue.
    *
    * @param element  the element to be added to the rear of this queue
    */
   public void enqueue (T element)
   {
      LinearNode<T> node = new LinearNode<T>(element);
 
      if (isEmpty())
         front = node;
      else
         rear.setNext (node);
 
      rear = node;
      count++;
   }
 
   public T dequeue() throws EmptyCollectionException
   {
      if (isEmpty())
         throw new EmptyCollectionException ("queue");
 
      T result = front.getElement();
      front = front.getNext();
      count--;
 
      if (isEmpty())
         rear = null;
 
      return result;
   }
 
   /**
    * Sets up this exception with an appropriate message.
    */
 
public ElementNotFoundException (String collection)
   {
      super ("The target element is not in this " + collection);
   }
}

below is where the errors are within the code, what exactly am i missing in this code?

/**
 * EmptyCollectionException represents the situation in which a collection
 * is empty.
 */
 
public class EmptyCollectionException extends RuntimeException
{
   /**
    * Sets up this exception with an appropriate message.
    */
   public EmptyCollectionException (String collection)
   {
      super ("The " + collection + " is empty.");
   }
}
}

**Norm** · July 21st, 2011, 12:33 PM

Please copy and paste here the full text of the error messages.
Not too many of us are compilers. We need the errors from the compiler to be able to tell you what the compiler sees is wrong with your code.

Did you read post#6?

Please edit your code and wrap it in code tags. Use Go Advanced, select your code and press the # icon above the input box.

**gerry123** · July 21st, 2011, 01:20 PM

Originally Posted by Norm

Please copy and paste here the full text of the error messages.
Not too many of us are compilers. We need the errors from the compiler to be able to tell you what the compiler sees is wrong with your code.

Did you read post#6?

Please edit your code and wrap it in code tags. Use Go Advanced, select your code and press the # icon above the input box.

All it says is as follows "error parsing file"

**Norm** · July 21st, 2011, 01:36 PM

All it says is

What is the "it"?
Can you get to a javac compiler?
Use that to get error messages with some meaning.

**gerry123** · July 21st, 2011, 01:54 PM

im using netbeans they dont clearly define error messages, what is a javac compliler?

**Norm** · July 21st, 2011, 02:01 PM

The javac compiler is the one installed with the JDK from Oracle.

**JavaPF** · July 21st, 2011, 02:18 PM

What IDE do you use?

**Norm** · July 21st, 2011, 02:22 PM

I don't use a proper IDE. I have an enhanced editor - syntax hilighting and multiple projects each with commandlines

**gerry123** · July 21st, 2011, 02:23 PM

Originally Posted by Norm

The javac compiler is the one installed with the JDK from Oracle.

after running the file i got the following message;

run:
Exception in thread "main" java.lang.ExceptionInInitializerError
at supermarketproject.SuperMarketSimulator.main(Super MarketSimulator.java:23)
Caused by: java.lang.RuntimeException: Uncompilable source code - cannot find symbol
symbol: class QueueADT
at supermarketproject.LinkedQueue.<clinit>(LinkedQueu e.java:7)
... 1 more
Java Result: 1
BUILD SUCCESSFUL (total time: 2 seconds)

**Norm** · July 21st, 2011, 02:26 PM

Where is QueueADT defined?

after running the file i got the following message;

IDEs are magic. This source won't compile. There is no way to execute it.
How can you "run" it?

**dlorde** · July 23rd, 2011, 04:18 PM

I can see where one error comes from - at the bottom of your LinkedQueue class, there is a method defined that doesn't have a return value specified, so it looks like a constructor, but it isn't a constructor. See under 'Sets up this exception with an appropriate message.'

ETA - I notice Norm pointed this out very early on in the thread...

Thread: HELP Error Parsing File

LinkBack

Thread Tools

Display

HELP Error Parsing File

Related threads:

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Re: HELP Error Parsing File

Similar Threads

Code for parsing .c file in java

[SOLVED] Parsing a text file in java

ERROR WHILE PROCESSING JSF FILE

Input file parsing to insert into DB

Error while deploying .ear file