关于同一个文件两次调用CDC切片的结果不同的问题

package inputCompare;

import inputCompare.chunk.Chunk;
import inputCompare.chunk.TttdChunker;
import inputCompare.chunk.TttdChunker.TTTDEnumeration;
import java.io.File;
import java.io.IOException;

public class CdcCompare {

    File file = null ;
	public CdcCompare(File block) {
 		file = block ;
	}
	
	public static void main(String[] args) {
		File part0 = new File("F:\Graph\blk_9213989683862805295");

		CdcCompare sc = new CdcCompare(part0);
		sc.run();
		
		System.out.println("\n");
		
		CdcCompare sc1 = new CdcCompare(part0);
		sc1.run();
	}
	
	public void run() {
		try {
		    TttdChunker chunker = new TttdChunker(1015);
			TTTDEnumeration chunksEnum = (TTTDEnumeration) chunker.createChunks(file);
			Chunk chunk = null ;

			while (chunksEnum.hasMoreElements()) {
				chunk = chunksEnum.nextElement();
				System.out.println(chunk.getChecksum());
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}
package inputCompare;

import inputCompare.chun