Thread: Java sliding block puzzle issues

I'm working on this task for my university, and I've come up to an impass.

Im trying to display in a system.out.println method to display the width and height of an image.

So far i've gotten it to load the image correctly, but whenever I put in the code to display the width and height (Using the getWidth and getHeight methods) the compiler tells me that it "Cannot find symbol" even when I declare the getWidth and getHeight in the code, I have no idea why this is, can anyone help me.

import java.awt.image.*;
import javax.imageio.*;
import java.io.File;
 
class SlidingBlockModel
{
	BufferedImage original_image; // the image to be cut up into blocks
	int numCols;  // number of columns in the grid of blocks
	int numRows;  // number of rows in the grid of blocks
	int empty_col; // holds the column index of the one empty grid element
	int empty_row; // holds the row index of the one empty grid element
	BufferedImage[][] puzzle; // the two '[][]' allows a 2-D array
               				  // to be created - each element is an image
 
 
	public static void main(String[] args)
		{
			SlidingBlockModel myModel;
 
			myModel = new SlidingBlockModel(5, 4, "Horseman-War.jpg");
 
		}
 
 
 
	SlidingBlockModel(int nc, int nr, String image_filename )
		{
			numCols = nc;
			numRows = nr;
 
			original_image = null;
 
			try
 
			{
				original_image = ImageIO.read(new File(image_filename));
				System.out.println("image " + image_filename + " loaded in ok.");
			}
 
 
			catch (Exception e)
 
			{
				System.out.println("Sorry - couldn't load in file " + image_filename);
 
			}
 
		System.out.println("Width of the window " +w);
		System.out.println("Height of the window " +h);
 
		}
 
}

Here is the error message:

C:\Users\Vesper\Desktop\Practical Programming - CI2250\Workshop 5\Task 2\SlidingBlockModel.java:48: cannot find symbol
symbol : variable w
location: class SlidingBlockModel
System.out.println("Width of the window " +w);
^
C:\Users\Vesper\Desktop\Practical Programming - CI2250\Workshop 5\Task 2\SlidingBlockModel.java:49: cannot find symbol
symbol : variable h
location: class SlidingBlockModel
System.out.println("Height of the window " +h);
^
2 errors

Tool completed with exit code 1

I declared them before using :

int w = getWidth();
int h = getHeight();

I put this in the class, in the constructor, everywhere but it gave me the same error saying that it couldn't find them, even though they were in the code.

import java.awt.image.*;
import javax.imageio.*;
import java.io.File;
 
 
class SlidingBlockModel
{
	BufferedImage original_image; // the image to be cut up into blocks
	int numCols;  // number of columns in the grid of blocks
	int numRows;  // number of rows in the grid of blocks
	int empty_col; // holds the column index of the one empty grid element
	int empty_row; // holds the row index of the one empty grid element
	BufferedImage[][] puzzle; // the two '[][]' allows a 2-D array
               				  // to be created - each element is an image
 
 
	public static void main(String[] args)
		{
			SlidingBlockModel myModel;
 
			myModel = new SlidingBlockModel(5, 4, "Horseman-War.jpg");
 
		}
 
 
 
	SlidingBlockModel(int nc, int nr, String image_filename )
		{
			numCols = nc;
			numRows = nr;
 
			int w = getWidth();
			int h = getHeight();
 
			original_image = null;
 
 
			try
 
			{
				original_image = ImageIO.read(new File(image_filename));
				System.out.println("image " + image_filename + " loaded in ok.");
			}
 
 
			catch (Exception e)
 
			{
				System.out.println("Sorry - couldn't load in file " + image_filename);
 
			}
 
		System.out.println("Width of the window " +w);
		System.out.println("Height of the window " +h);
 
		}
 
}

C:\Users\Vesper\Desktop\Practical Programming - CI2250\Workshop 5\Task 2\SlidingBlockModel.java:32: cannot find symbol
symbol : method getWidth()
location: class SlidingBlockModel
int w = getWidth();
^
C:\Users\Vesper\Desktop\Practical Programming - CI2250\Workshop 5\Task 2\SlidingBlockModel.java:33: cannot find symbol
symbol : method getHeight()
location: class SlidingBlockModel
int h = getHeight();
^
2 errors

Tool completed with exit code 1

SlidingBlockModel(int nc, int nr, String image_filename )
{
numCols = nc;
numRows = nr;

int w = getWidth();
int h = getHeight();

original_image = null;



Pretty sure I declared it....

But how do I declare it? and where would I declare it, everything i've tried doesn't seem to work.

That still tells me nothing, it's trying to find getWidth and getHeight which are part of the Java library, this is what im finding confusing. It's not finding something that i've already imported from and as such my code isn't working.

Problem fixed, everything you linked me was completely opposite of the fix that was found.