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Thread: Need a bit of help with Linked List program

  1. #1
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    Default Need a bit of help with Linked List program

    Hey programmers. I've been at this program for a little over two weeks, and could really use some expert help. Basically, I'm trying to read a text file into two integers x and y (which will be used later for coordinates). I've created a vertex class to get/set the x and y coordinates. Lastly, I'm trying to pass the coordinates into a Linked List. I've implemented the Linked List class with helper methods, and everything is fine in that class. In the main program I'm getting an error that says, "cannot find symbol." Please help. I've included code.

     args){
    		CircLinkedList<Vertex> vertexList = new CircLinkedList<Vertex>();
    		String fileName = "test.txt";
    		File file = new File(fileName);
    		try{
    			Scanner inputStream = new Scanner(file);
    			while(inputStream.hasNext()){
    				String data = inputStream.next();
    				String[] values = data.split(",");
    				int x = Integer.parseInt(values[1]);
    				int y = Integer.parseInt(values[2]);
    			}
     
    		inputStream.close();
    		}
    		catch(FileNotFoundException e){
    			System.out.print("File not found");
    		}
     
    		Vertex coordinates = new Vertex(x,y);
    		vertexList.addFirst(coordinates);
     
    	}
     
    }

    and the vertex class

    import java.util.*;
     
     
    public class Vertex {
     
    	int xCord;
    	int yCord;
    	double n;
     
    	public Vertex(int x, int y){
    		xCord = x;
    		yCord = y;
    		n = (Double) null;
    	}
     
    	public int getX(){
    		return xCord;
    	}
     
    	public int getY(){
    		return yCord;
    	}
     
    	public double getN(){
    		return n;
    	}
     
    	public void setX(int x){
    		xCord = x;
    	}
     
    	public void setY(int y){
    		yCord = y;
    	}
     
    	public void setN(double n){
    		this.n = n;
    	}
     
    }

    thanks again.


  2. #2
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    Default Re: Need a bit of help with Linked List program

    Post the exact error, the whole thing, copied and pasted.

    "Cannot find symbol" means the compiler encountered a variable name (the 'symbol') that was not declared within the scope it was found. It doesn't know what type the variable is. The error message/stack trace (the thing I asked you to post) will tell you exactly what the offending symbol is, where it was found, etc.

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