Java

Java RSS

First Attempt at Arrays

Thread Solved

Last »

•

Join Date: Jul 2007

Posts: 226

Reputation: no1zson is on a distinguished road

Solved Threads: 1

no1zson

Offline

Posting Whiz in Training

First Attempt at Arrays

Jul 12th, 2007

I have just been using a standard String to input and return information. I am trying to impliment an Array in to this inventory program so that I can store and view more than one item at a time.
I think I have done ok until I get to the Return part of the program. I have tried several different things but nothing seems to work.
As it is, I am getting a "cannot find symbol" error message on "cdName" in the return statment. Any help on what I am doing wrong?

Help with Code Tags

(Toggle Plain Text)

public class Compactdisk
{// begin class

	//InventoryCD class has 5 fields
	String cdName[]; //  cd name array
	float price; // price of cd
	int itemno; // item number of cd
	int nstock; // how many units in stock	
	
	//Compact disk class constructor
	public Compactdisk()
	
		// 4 fields need to be set up
		{ 
		cdName = new String [25];
		price = 0;
		itemno = 0;
		nstock = 0;
		}
		
		// set values
	   public void setCDName(String diskName)
	   {
	   cdName = cdName;
	   }
		public void setPrice(float cdPrice)
	   {
	   price = cdPrice;
	   }
		public void setItemno(int cdItemno)
	   {
	   itemno = cdItemno;
	   }
		 public void setNstock(int cdStock)
	   {
	   nstock = cdStock;
	   }
		
	   // return values
		public String getCDName()
		{	
		return cdName();
		}
		public float getPrice()
		{	
		return (price);
		}
		public int getItemno()
		{	
		return (itemno);
		}
		public int getNstock()
		{	
		return (nstock);
		}
					
		// returns inventory value
	   public float getValue()
	   {
	   return(price * nstock);
	   }


}// end class

I never drew first, but I drew first blood.
I'm no ones son, unforgiven.

•

Join Date: Aug 2005

Posts: 5,264

Reputation: iamthwee is a splendid one to behold

Solved Threads: 377

iamthwee

Offline

Posting Expert

Re: First Attempt at Arrays

Jul 12th, 2007

hint:is that how you declare an array in java? Or is it an array

String cdName[];

Last edited by iamthwee; Jul 12th, 2007 at 5:36 pm.

*Voted best profile in the world*

•

Join Date: Jul 2007

Posts: 226

Reputation: no1zson is on a distinguished road

Solved Threads: 1

no1zson

Offline

Posting Whiz in Training

Re: First Attempt at Arrays

Jul 12th, 2007

I did have it all in one line to begin with, (declaring and creating)

String cdName[] = new String [25]

but it is easier for me to read this way, and I get the same error either way.
Those are the only two ways I have learned to do this, unless I am just way off base right now and doing something wrong.

I never drew first, but I drew first blood.
I'm no ones son, unforgiven.

•

Join Date: May 2007

Posts: 4,424

Reputation: Ezzaral has much to be proud of

Solved Threads: 507

Ezzaral

Offline

Industrious Poster

Re: First Attempt at Arrays

Jul 12th, 2007

Take another look at the line you have bolded - the return line. Does it match any variable in your program?

•

Join Date: Jul 2007

Posts: 226

Reputation: no1zson is on a distinguished road

Solved Threads: 1

no1zson

Offline

Posting Whiz in Training

Re: First Attempt at Arrays

Jul 12th, 2007

I am really starting to feel dumb. I am either missing something right in front of my face, or completely do not understand the question. I see what I think is the variable name several times, through the setup, initialization and everything.

//InventoryCD class has 5 fields
String cdName[]; // cd name array

// 4 fields need to be set up
cdName = new String [25];

// set values
public void setCDName(String diskName)
{
cdName = cdName;

I tried diskName as well, just because I was so frustrated, but same error.

I never drew first, but I drew first blood.
I'm no ones son, unforgiven.

•

Join Date: Mar 2007

Posts: 686

Reputation: sillyboy is on a distinguished road

Solved Threads: 61

sillyboy

Offline

Practically a Master Poster

Re: First Attempt at Arrays

Jul 13th, 2007

cdName() is trying to call a function called "cdName". Elements of string are referenced using [...] (if that is what you want to do). Also, your setter method is pretty much useless, I think you mean cdName = diskName?

Last edited by sillyboy; Jul 13th, 2007 at 12:26 am.

•

Join Date: Jul 2007

Posts: 226

Reputation: no1zson is on a distinguished road

Solved Threads: 1

no1zson

Offline

Posting Whiz in Training

Re: First Attempt at Arrays

Jul 13th, 2007

I had cdName = diskName when I first started implimenting this array. That line gave me an "incompatible types" error. Changing it to what it is now enabled me to move on to the next and current error.

I never drew first, but I drew first blood.
I'm no ones son, unforgiven.

•

Join Date: Jul 2007

Posts: 226

Reputation: no1zson is on a distinguished road

Solved Threads: 1

no1zson

Offline

Posting Whiz in Training

Re: First Attempt at Arrays

Jul 13th, 2007

The problem appears to be that I was trying to set up and array to take the place of cdName, and that is not what I really wanted to do.
I want an array to use cdName. So had gone through and tried to replace all my cd name variables, gets, and sets with array instances and it was just confusing itself. I put my code back the way it was, added an array and that seems to have gotten the first step done.
Code now looks like this:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
public class Compactdisk
{// begin class
 
	// set up array
	String cdaName[]= new String[5];
 
	//InventoryCD class has 5 fields
	String cdName; //  cd name
	float price; // price of cd
	int itemno; // item number of cd
	int nstock; // how many units in stock	
 
	//Compact disk class constructor
	public Compactdisk()
 
		// 4 fields need to be set up
		{ 
		cdName = "";
		price = 0;
		itemno = 0;
		nstock = 0;
		}
 
		// set values
	   public void setCDName(String diskName)
	   {
	   cdName = diskName;
	   }
		public void setPrice(float cdPrice)
	   {
	   price = cdPrice;
	   }
		public void setItemno(int cdItemno)
	   {
	   itemno = cdItemno;
	   }
		 public void setNstock(int cdStock)
	   {
	   nstock = cdStock;
	   }
 
	   // return values
		public String getCDName()
		{	
		return (cdName);
		}
		public float getPrice()
		{	
		return (price);
		}
		public int getItemno()
		{	
		return (itemno);
		}
		public int getNstock()
		{	
		return (nstock);
		}
 
		// returns inventory value
	   public float getValue()
	   {
	   return(price * nstock);
	   }
 
 
}// end class
public class Compactdisk
{// begin class

	// set up array
	String cdaName[]= new String[5];

	//InventoryCD class has 5 fields
	String cdName; //  cd name
	float price; // price of cd
	int itemno; // item number of cd
	int nstock; // how many units in stock	
	
	//Compact disk class constructor
	public Compactdisk()
	
		// 4 fields need to be set up
		{ 
		cdName = "";
		price = 0;
		itemno = 0;
		nstock = 0;
		}
		
		// set values
	   public void setCDName(String diskName)
	   {
	   cdName = diskName;
	   }
		public void setPrice(float cdPrice)
	   {
	   price = cdPrice;
	   }
		public void setItemno(int cdItemno)
	   {
	   itemno = cdItemno;
	   }
		 public void setNstock(int cdStock)
	   {
	   nstock = cdStock;
	   }
		
	   // return values
		public String getCDName()
		{	
		return (cdName);
		}
		public float getPrice()
		{	
		return (price);
		}
		public int getItemno()
		{	
		return (itemno);
		}
		public int getNstock()
		{	
		return (nstock);
		}
					
		// returns inventory value
	   public float getValue()
	   {
	   return(price * nstock);
	   }


}// end class

Now if I can effectivley impliment and use this array is another story altogether. We will see.

I never drew first, but I drew first blood.
I'm no ones son, unforgiven.

•

Join Date: May 2007

Posts: 4,424

Reputation: Ezzaral has much to be proud of

Solved Threads: 507

Ezzaral

Offline

Industrious Poster

Re: First Attempt at Arrays

Jul 13th, 2007

Why do you wish to use an array for cd name? A cd only has a single name.

•

Join Date: Jul 2007

Posts: 226

Reputation: no1zson is on a distinguished road

Solved Threads: 1

no1zson

Offline

Posting Whiz in Training

Re: First Attempt at Arrays

#10

Jul 13th, 2007

That was part of my misunderstanding. I was going to create an array for each variable. (I thought each variable would be a different type and require its own array).
Now I understand that I can use a single array for all field types. I just left in named cdaName because that made the most sence to me, it will be an array of cd information.
My problem now is that I do not understand where to put this array. I want it to be populated with information input from the user, so I think I need to keep all my get and set code, but where does my array tie in? Do I need to create another class completley?
I think my array should look something like

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
String cdaName[]= new String{cdName, price, itemno, nstock};
String cdaName[]= new String{cdName, price, itemno, nstock};

but I cannot find any examples of such a beast for me to learn and build off of.