package opencvtest; // назовём пакет так
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
public class HelloOpenCV
{
public static void main( String[] args )
{
System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
Mat mat = Mat.eye( 3, 3, CvType.CV_8UC1 );
System.out.println( "mat = " + mat.dump() );
}