Java Simple Tail

Many time we need to see application log but not for all log but for last line or -n line. As wee know tail in *NIX,solaris,etc have function like tail [-f] filename. And how if we make this future with JAVA code. This time i only give you a simple tail basic function that you have to extend it Here is the code:

 public String seek( String fileName , int line) {
  try {
         java.io.File file = new java.io.File( fileName );
      
         if( !file.exists() ){
          System.out.println("File Not Found");
          System.exit(0);
         }
         RandomAccessFile fileHandler = new RandomAccessFile( file, "r" );
         long fileLength = file.length() - 1;
         int newLineCount = 0;
         int carrierLineCount = 0;
         StringBuilder sb = new StringBuilder();
 
         for( long filePointer = fileLength; filePointer != -1; filePointer-- ) {
             fileHandler.seek( filePointer );
             int readByte = fileHandler.readByte();
             if( readByte == 0xA ) {              
              if( filePointer == fileLength ) {                  
                     continue;
                 } else {
                  newLineCount++;
                  if( newLineCount == line )
                   break;
              }
             } else if( readByte == 0xD ) {              
              if( filePointer == fileLength - 1 ) {
                  continue;
                 } else{                  
                  carrierLineCount++;
                  if( carrierLineCount == line )
                   break;
              }          
             }
             sb.append( ( char ) readByte );
         }
 
         String lastLine = sb.reverse().toString();
         return lastLine;
     } catch( java.io.FileNotFoundException e ) {
         e.printStackTrace();
         return null;
     } catch( java.io.IOException e ) {
         e.printStackTrace();
         return null;
     }
 }