Throwing an Exception in paintComponent

Im writing a class called PolygonPanel. The class stores the users mouse clicks and redraws a polyline everytime the user clicks the mouse, then when the user presses the c key the polyline becomes a polygon and the coordinates of the polygon are stored in a text file

The problem i am having is trying to get the save method to work in the paintComponent method. Any help would be appreciated and i can provide more of the class if needed.


below is the paintComponent and the save method of the PolygonPanel

Code java:

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public void paintComponent (Graphics page)
	{
 
 
		page.setColor (Color.red);
		page.drawPolyline(x_coords, y_coords, numPoints);
        if (capture == true)// in other words when user presses c key
		{
			page.drawPolygon (x_coords, y_coords, numPoints);
			save("SavedPolygons.rtf");//write the coordinates to this file
            //resests the coordinates for another polygon/polyline to be created
			for (int i = 0; i<numPoints; i++)
			{
				x_coords[numPoints] = 0;
				y_coords[numPoints] = 0;
			}
			numPoints = 0;
		}
 
	}
 
	public void save(String file) throws IOException
	{
		PrintWriter out = new PrintWriter(new FileWriter(file));
		out.println(toString());
		out.close();
	}

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Quote:

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public void save(String file) throws IOException

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this method is throwing exception , but you are not catching the exception in the calling method.

paintComponent is an overrided method , so its not possible to throw exception from paintComponent,
so you need to handle it in save itself or in paintComponent .