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I'am new to opencv I want to understand the opencv Mat class

For the get method

I try the first one int get(int row, int col, byte[] data) with this example

Mat mat = Mat.eye( 3, 3, CvType.CV_8UC1 );

System.out.println(mat.dump());

byte[] data = new byte[mat.cols() * mat.rows() * (int)mat.elemSize()];

System.out.println(data.length);-->9

System.out.println( mat.get(0, 0, data)); -->9 but I can't understand

1) the role of the third argument byte[] data

2) and the result

I'am new to opencv I want to understand the opencv Mat class

For the get method

I try the first one int get(int row, int col, byte[] data) with this example

 Mat mat = Mat.eye( 3, 3, CvType.CV_8UC1 );
 
System.out.println(mat.dump());
 
);
  System.out.println(mat.dump());
  byte[] data = new byte[mat.cols() * mat.rows() * (int)mat.elemSize()];
 
System.out.println(data.length);-->9
 
(int)mat.elemSize()];
  System.out.println(data.length);-->9
  System.out.println( mat.get(0, 0, data)); -->9