Thread: Object as a Reference into Object's Class

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?