Object as a Reference into Object's Class

**Ace Coder** · November 28th, 2010, 03:48 PM

Basically I have:

A main class:

public class mainClass 
{
    public static void main(String[] args) 
    {
        extraClass First=new extraClass("First",1,true);
        extraClass Second=new extraClass("Second",2,true);
        extraClass Third=new extraClass("Third",3,false);
 
        extraClass.compareObjects(First,Second);
    }
}

And an extraClass:

public class extraClass
{
	private String objectName;
	private int objectID;
	private Boolean isUsed;
 
	public extraClass(String tempName,int tempID,Boolean tempUsed)
	{
		objectName=tempName;
		objectID=tempID;
		isUsed=tempUsed;
	}
 
	public static void compareObjects(extraClass objectOne,extraClass objectTwo)
	{
		if (((objectOne.objectName.equalsIgnoreCase("First")&&(objectTwo.objectName.equalsIgnoreCase("Second"))) || (objectOne.objectName.equalsIgnoreCase("Second"))&&(objectTwo.objectName.equalsIgnoreCase("First"))) && (!Third.checkUsed))
		{
			Third.setUsed(Third);
			System.out.println("Yeah");
		}
	}
 
	public Boolean checkUsed(extraClass tempName)
	{
		if (tempName.isUsed)
			return true;
		else
			return false;
	}
 
	public void setUsed(extraClass tempName)
	{
		tempName.isUsed=true;
	}
}

I'm given the errors:

cannot find symbol variable Third
cannot find symbol variable Third
cannot find symbol variable Third

The problem is in the compareObjects method in the extraClass when I attempt to use an object I created in the mainClass using the extraClass.
Any ideas?

**newbie** · November 29th, 2010, 06:22 PM

&& (!Third.checkUsed))
Third.setUsed(Third);

You invoke methods on Third, which hasn't been declared anywhere in your 'extraClass' Class.
Not sure what you're trying to do with 'Third' in extraClass. I'm no expert by a long shot, but I got a feeling what you're thinking of doing isn't possible.

Also it would be a good idea to stick to the convention of starting class names with capital letters and variables with lower case, so for your example, "ExtraClass" and variables as follow's "aVariable"

Either way, good luck.

**Ace Coder** · November 29th, 2010, 06:48 PM

Originally Posted by newbie

&& (!Third.checkUsed))
Third.setUsed(Third);

You invoke methods on Third, which hasn't been declared anywhere in your 'extraClass' Class.
Not sure what you're trying to do with 'Third' in extraClass. I'm no expert by a long shot, but I got a feeling what you're thinking of doing isn't possible.

Also it would be a good idea to stick to the convention of starting class names with capital letters and variables with lower case, so for your example, "ExtraClass" and variables as follow's "aVariable"

Either way, good luck.

The Third object was declared and initialized in the Main class.

**newbie** · November 29th, 2010, 06:51 PM

Well yeah, but it has no reference within "extraClass", its an instance of extraClass.

**Ace Coder** · November 29th, 2010, 07:52 PM

Originally Posted by newbie

Well yeah, but it has no reference within "extraClass", its an instance of extraClass.

Alright that's where I'm lost. How can I either get extraClass to 'see' Third, or possibly accomplish the same goal in a different way?

**newbie** · November 30th, 2010, 06:25 AM

Well firstly, state you're design specification, what are you trying to accomplish?

Also is there a reason you are trying invoke a Boolean variable isUsed? i.e, its not a method.

**Ace Coder** · November 30th, 2010, 12:22 PM

This is a small part of a project I've started on, but what I'm trying to accomplish with this example code is combine different objects to create a new object. This will be used in a simple DOS era alchemy type of game.

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