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Which classifier is used for combing SURF, SIFT, and HARRIS CORNER DETECTOR

i want to check is the two images are same by using SIFT their sift descriptors. or is the 2nd image contain the first images?? any suggestion please.

Mat image =Highgui.imread(src, 1 ); Mat gray_image=image; Imgproc.cvtColor( image, gray_image,Imgproc.COLOR_BGRA2GRAY ); Mat dst = Mat.zeros( image.size(),CvType.CV_32FC1);

 /// Detector parameters
 int blockSize = 2;
 int apertureSize = 3;
 double k = 0.04;

 Imgproc.cornerHarris(gray_image, dst, blockSize, apertureSize, k);
Mat dst_norm=gray_image;
 Core.normalize(dst, dst_norm, 0, 255,Core.NORM_MINMAX,CvType.CV_32FC1);
 Mat dst_norm_scaled=dst_norm;
 Core.convertScaleAbs(dst_norm, dst_norm_scaled);

 for( int j = 0; j < dst_norm.rows() ; j++ )
 { 
     for( int i = 0; i < dst_norm.cols(); i++ )
      {
        **if( (int) dst_norm.at<float>(j,i) > thresh )** //dst_norm.at<float>(j,i) not used in java any solution plz
         {

// }

      }
 }

dst_norm.at<float>(j,i) not used in java any solution plz

Mat image =Highgui.imread(src, 1 ); Mat gray_image=image; Imgproc.cvtColor( image, gray_image,Imgproc.COLOR_BGRA2GRAY ); Mat dst = Mat.zeros( image.size(),CvType.CV_32FC1);

     /// Detector parameters
     int blockSize = 2;
     int apertureSize = 3;
     double k = 0.04;

     Imgproc.cornerHarris(gray_image, dst, blockSize, apertureSize, k);
    Mat dst_norm=gray_image;
     Core.normalize(dst, dst_norm, 0, 255,Core.NORM_MINMAX,CvType.CV_32FC1);
     Mat dst_norm_scaled=dst_norm;
     Core.convertScaleAbs(dst_norm, dst_norm_scaled);

     for( int j = 0; j < dst_norm.rows() ; j++ )
     { 
         for( int i = 0; i < dst_norm.cols(); i++ )
          {
            **if( (int) dst_norm.at<float>(j,i) > thresh )** //dst_norm.at<float>(j,i) not used in java any solution plz
             {

// }

          }
     }

dst_norm.at<float>(j,i) not used in java any solution plz

Hi every one i need equalent function of Mat.at(j,i) in java