Comparint contents of 2 files in different folders

[Eduardo Ponce de Leon]

I am working on an app that download files from an sftp server...comparing things in a server and on a local machine got a bit too much for me! So i have decided to download the txt. files to a temp folder. What i am trying to do is compare the data newly downloaded txt file with the one in the local machine. So that if the contents of the files are the same i can do X if not Y. Any help! Ive tried hashCode() from java.io.File and lastModified() but those function calls refer to pathfilename and that is why i don't think the comparison is working for me.

[Carey Brown]

public static boolean isDuplicate( File f1, File f2 )
	{
        int         i, n1, n2;
        byte[]      b1 = new byte[4096];
        byte[]      b2 = new byte[4096];
        FileInputStream         is1 = null;
        FileInputStream         is2 = null;

        if( ! f1.isFile() ||
            ! f2.isFile() ||
            f1.length() != f2.length() )
            return false;

        try
        {
            is1 = new FileInputStream( f1 );
            is2 = new FileInputStream( f2 );

             for(;;)
             {
            n1 = is1.read( b1 );
            n2 = is2.read( b2 );

            if( n1 != n2 )
                throw new Exception( "Number of bytes read from two files are not the same." );

            if( n1 < 0 )
                  break;
            for( i=0 ; i < n1 ; i++ )
                if( b1[ i ] != b2[ i ] )
                    return false;
             }
        }
        catch( Exception e )
        {
            frame.logException( e.toString() );
        }
        finally
        {
            try
            {
                if( is1 != null )   is1.close();
                if( is2 != null )   is2.close();
            }
            catch( Exception e )
            {
                frame.logException( e.toString() );
            }
        }

		return true;
	}

[Carey Brown]

Oops. Forgot a for() loop in there.

[Eduardo Ponce de Leon]

for some reason that didnt work for me... so i came up with a different approach but i am stuck comparing..
This is where i am getting my error...Is there another way of comparing array of type long

int value = sizeTempFolder[i].compareTo(sizeWorkFolder[i]);


i store

this is in main()
String tempFolder = "C:\\SnapshotClient\\temp"; //temp folder for downloading files
String workFolder = "C:\\SnapshotClient\\DataFiles"; //Work folder for processing Snapshot files

File tempFile = new File(tempFolder); //For working in temp folder
File workFile = new File(workFolder); //For working in work folder

File[] filesInTempFolder = tempFile.listFiles(); //Storing files in temp Folder
File[] filesInWorkFolder = workFile.listFiles();


THIS IS MY FUNCTION CALL---
public static void compareSizeOfFiles(File[] tempFolder, File[] localFolder) {

long sizeTempFolder[] = null;
long sizeWorkFolder[] = null;

System.out.println("*** LISTING CONTENTS OF temp FOLDER ****");
for(int i = 0; i < tempFolder.length; i++){
sizeTempFolder[i] = tempFolder[i].length(); // store size of file in array
System.out.println("Lenght of "+tempFolder[i]+" is "+sizeTempFolder[i]);
}

System.out.println();
System.out.println("*** LISTING CONTENTS OF SnapshotFiles FOLDER ****");
for(int i = 0; i < localFolder.length; i++){
sizeWorkFolder[i] = localFolder[i].length(); // store size of file in array
System.out.println("Lenght of "+localFolder[i]+" is "+sizeWorkFolder[i]);
}

System.out.println("*** COMPARING FILES ****");
for(int i=0; i<tempFolder.length; i++) {
int value = sizeTempFolder[i].compareTo(sizeWorkFolder[i]);
System.out.println(value);
}