Java™ How To Program (Early Objects), Tenth Edition

Using the Custom JPanel in an Application

Class Painter (Fig. 12.35) contains the main method that executes this application. Line 14 creates a PaintPanel object on which the user can drag the mouse to draw. Line 15 attaches the PaintPanel to the JFrame.

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 1   // Fig. 12.35: Painter.java 2   // Testing PaintPanel. 3   import java.awt.BorderLayout; 4   import javax.swing.JFrame; 5   import javax.swing.JLabel; 6  7   public class Painter 8   { 9      public static void main(String[] args)10      {11         // create JFrame12         JFrame application = new JFrame("A simple paint program");13 14         PaintPanel paintPanel = new PaintPanel();15         application.add(paintPanel, BorderLayout.CENTER);16 17          ...