Review Exercises - Class 4

1. Why doesn't the following code segment show anything?

        Picture p;
        p = new Picture(200,200);
        g = p.getGraphics();
        g.setColor(Color.blue);
        g.fillOval(200,300,50,70);
        p.repaint();
   

2. Why doesn't the following code segment show anything?

        Picture p;
        p = new Picture(200,200);
        g = p.getGraphics();
        g.fillRect(100,100,20,40);
        p.repaint();
   

3. What is a class variable?
4. What is a method variable?
5. What is an actual parameter?
6. What is a formal parameter?
7. What is the scope of a variable?