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package imageChecker;
import java.io.*;

public class imageChecker
{
    public static void main(String args[]) throws IOException
    {
        FileReader oldFile = new FileReader("C:\\Users\\Matthew\\Desktop\\New folder\\old.xml");
        BufferedReader oldFileIn = new BufferedReader(oldFile);        
        FileReader newFile = new FileReader("C:\\Users\\Matthew\\Desktop\\New folder\\new.xml");
        BufferedReader newFileIn = new BufferedReader(newFile);
        
        FileWriter fileOld = new FileWriter("C:\\Users\\Matthew\\Desktop\\New folder\\oldItems.txt");
        BufferedWriter fileOldOut = new BufferedWriter(fileOld);        
        FileWriter fileNew = new FileWriter("C:\\Users\\Matthew\\Desktop\\New folder\\newItems.txt");
        BufferedWriter fileNewOut = new BufferedWriter(fileNew);
        
        //only take the part of the code at the bottom of the files that have the image hashes
        int startAtOld = 199674;
        int stopAtOld = 220913;
        for(int i = 0; i < stopAtOld; i++)
        {
            String oldLine = oldFileIn.readLine();
            if(i >= startAtOld)
            {
                fileOldOut.write(oldLine + "\r");
                fileOldOut.flush();
            }
        }
        
        //only take the part of the code at the bottom of the files that have the image hashes
        int startAtNew = 200566;
        int stopAtNew = 221847;
        for(int i = 0; i < stopAtNew; i++)
        {
            String oldLine = newFileIn.readLine();
            if(i >= startAtNew)
            {
                fileNewOut.write(oldLine + "\r");
                fileNewOut.flush();
            }
        }
        
        //reset the file readers to use the snipped codes obtained above that lists only the images
        oldFile = new FileReader("C:\\Users\\Matthew\\Desktop\\New folder\\oldItems.txt");
        oldFileIn = new BufferedReader(oldFile);
        newFile = new FileReader("C:\\Users\\Matthew\\Desktop\\New folder\\newItems.txt");
        newFileIn = new BufferedReader(newFile);
        
        //setup the writer to output only the differences between the files above
        FileWriter diffs = new FileWriter("C:\\Users\\Matthew\\Desktop\\New folder\\diffs.txt");
        BufferedWriter diffsOut = new BufferedWriter(diffs);
        
        //compare the old files
        String newLine = newFileIn.readLine();
        boolean found = false;
        while(newLine != null)
        {
            oldFile = new FileReader("C:\\Users\\Matthew\\Desktop\\New folder\\oldItems.txt");
            oldFileIn = new BufferedReader(oldFile);
            String oldLine = oldFileIn.readLine();
            while(oldLine != null && !found)
            {
                if(newLine.equals(oldLine))
                {
                    found = true;
                }
                oldLine = oldFileIn.readLine();
            }
            if(!found)
            {
                diffsOut.write(newLine + "\r");
                diffsOut.flush();
                System.out.println(newLine);
            }
            found = false;
            newLine = newFileIn.readLine();
        }
        diffsOut.close();
    }
}

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