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Herewith relevant code.


class Jexp3 extends JPanel implements MouseListener
{
int mouseX, mouseY;
int width, height;
Graphics2D graphics;
Color color;
public Jexp3()

Graphics2D graphics;

graphics.fillOval(x1,y1,x2,y2);



The .java program compiles with no errors.
However. when I try to run it I get a long list of exceptions when it comes to the above...

Thanks.
I have learned all about packages.
It now works fine

I compile from the command prompt using the JDK tools.
I have set the class path.
I think that I have copied the demo exactly.
BlankArea.java compiled as did MouseEventDemo.java.
I come to Java...

Oracle's MouseEventDemo.java does not compile.
I get error message "Cannot find BlankArea class"
BlankArea class exists in same folder as MouseEventDemo.
I'm stumped.