The following code should draw a blue, filled, circle of diameter 4 that corresponds to the movement of the mouse. Find the error(s) in the following code:

Question

```
1 public void paintComponent( Graphics g )
2 {
3 if ( currentPoint != null )
4 {
5 g.fillOval( Color.BLUE, currentPoint.y, currentPoint.x, 4, 5 );
6 }
7
8 } // end method paintComponent
```

Answer 1

The color of the shape must be set using the setColor method of the Graphics class; it should not be specified in the call to the fillOval method. The x and y coordinates of the Point object are reversed. A circle is an oval with the same width and height, so the last argument sent to the fillOval method should be 4. The corrected code is listed below.
```
1 public void paintComponent( Graphics g )
2 {
3 if ( currentPoint != null )
4 {
5 g.setColor( Color.BLUE );
6 g.fillOval( currentPoint.x, currentPoint.y, 4, 4 );
7 }
8
9 } // end method paintComponent
```