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

Class TestDraw

Class TestDraw in Fig. 8.19 sets up a new window to display our drawing. Since we’re setting the coordinates for the lines only once in the constructor, the drawing does not change if paintComponent is called to refresh the drawing on the screen.

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 1   // Fig. 8.19: TestDraw.java 2   // Creating a JFrame to display a DrawPanel. 3   import javax.swing.JFrame; 4  5   public class TestDraw 6   { 7      public static void main(String[] args) 8      { 9         DrawPanel panel = new DrawPanel();10         JFrame app = new JFrame();11 12         app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);13         app.add(panel);14         app.setSize(300, 300);15         app.setVisible(true);16      }17   } ...