1. GUI AND GRAPHICS

2. CLASS LIBRARIES
import java.awt.Graphics;
import javax.swing.JPanel;
import javax.swing.JFrame;

3. HOW DO WE DRAW?
Graphics: reference for shapes, contains the paintComponent
JPanel: provides an area to draw
JFrame: Holds and displays the panel

4. A Simple Application Window
A stand-alone GUI (Graphical User Interface) application runs in a window.
Code for application window exists in class ‘JFrame’

5. Main Class JFrame Create a window Set the frame to exit
Add panel to frame
Set the size of the frame
Make the frame visible

6. Code for Application Window

7. Displaying ‘MyClass’ Panel
This happens in the main class
Create a window (JFrame) with an object to call ‘MyClass’
Window has specifications

8. ‘MyClass’ extends JPanel
Create a new class – Panel to be displayed
MyClass for drawing must extend JPanel
Inheritance relationship, ‘MyClass’ will begin with existing members of class JPanel
JPanel is the superclass ; MyClass is the subclass

9. paintComponent Method
Every JPanel contains a paintComponent method
Used to display panel
Syntax:
public void paintComponent( Graphics g)
Requires one argument, a Graphics object:
super.paintComponent(g);

10. Create a New Class to hold Panel

11. Add Panel to Frame