742: Highlights

• If you want to draw in a window, then create a subclass of the JComponent class, by instantiating the following pattern:

  import java.awt.*; 
  import javax.swing.*; 
  public class subclass name extends JComponent { 
   ... 
   public void paint(Graphics g) { 
    // Drawing statements go here 
   } 
  } 
  

  and then , attach a new instance of the JComponent subclass to a JFrame instance's content pane by adding the following statement to the frame constructor:

  getContentPane().add(position, subclass instance);  
  

  The position can be "Center", "North", "East", "South", or "West".

• If you want to draw a line, then add a drawLine statement to the paint method defined in a subclass of the JComponent class.
• If you want to determine the size of a component, then use the width and height variables of the Dimension instance produced by the getSize method.
• If you want to get the state of the graphics context established by Java for the paint method defined in a subclass of the JComponent class, then use getters such as getColor.
• If you want to set the state of the graphics context established by Java for the paint method defined in a subclass of the JComponent class, then use setters such as setColor.