How to set the size of Drawing pane

[cassysumandak]

Hi, I have problem to get the right size dimension of my drawing panel.
I set the dimension size of 400,400. However, it seems that the drawing panel is larger than 400,400.
How can I make the drawing panel exactly the same size by 400,400.

public class DrawingBoardWithMatrix extends JFrame {
	
  public static void main(String[] args) {
      new DrawingBoardWithMatrix();
  }

  public DrawingBoardWithMatrix(){ 	
	  Container c = getContentPane();
	  c.add(new PaintSurface(), BorderLayout.CENTER);
      c.setPreferredSize(new Dimension (400,400));    	
	  pack();
	  this.setVisible(true);
	  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    
	  setResizable(false); 
  }

[Fubarable]

What if you call setResizable(false) before calling pack?

[cassysumandak]

Thanks Fubarable, that's solved my problem :-).