1. Simple Control Structures boolean s, the if statement switch-case

9. Flowchart for the if statement condition? statement true false

12. Flowchart for the if-else statement condition? true statement-1 statement-2 false

25. Boolean operators ! || && Java true if parameter is false; false if parameter is true; NOT true if at least one parameter is true OR true if both parameters are true AND Meaning Boolean Algebra

28. Afvinkopdracht 5: Tic-tac-toe

29. Graphic programming The GUI revisited

33. import javax.swing.*; class MyFrame extends JFrame { public MyFrame() { setTitle("My first graphics program"); setSize(400,300); } } public class FrameTest { public static void main(String[] args) { JFrame frame=new MyFrame(); frame.show(); } }

37. JFrame JComponent JPanel … .. Component Frame Window Container

40. Content pane Frame JPanel SomeText JField

46. import javax.swing.*; import java.awt.*; public class MyPanel extends JPanel { public void paintComponent(Graphics g) { super.paintComponent(g); g.drawString("Hello there!",150,125); } }

47. import java.awt.event.*; import javax.swing.*; import java.awt.*; public class HelloFrame extends JFrame { public HelloFrame() { setTitle("Drawing a string example"); setSize(400,300); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); Container contentPane=getContentPane(); contentPane.add(new MyPanel()); } }

48. public class FrameTest { public static void main(String[] args) { JFrame frame=new HelloFrame(); frame.show(); } }

54. class DrawPanel extends JPanel { public void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.red); g.drawRect(20,30,50,50); g.setColor(Color.green); g.drawOval(100,30,90,60); g.fillOval(100,30,90,60); g.setColor(Color.yellow); int[] xcoords={180,200,250,275,225}; int[] ycoords={170,130,130,150,200}; g.drawPolygon(xcoords,ycoords,5); g.fillPolygon(xcoords,ycoords,5); } }

57. Normal program thread Load image from file Create new thread Image loading thread Program waits to be informed when image loaded Image loading complete – send signal Normal program thread resumes

59. import java.awt.*; import java.awt.event.*; import javax.swing.*; class ImagePanel extends JPanel { public ImagePanel() { image = Toolkit.getDefaultToolkit().getImage( “Pisa.jpg” ); MediaTracker tracker=new MediaTracker(this); tracker.addImage(image,0); try {tracker.waitForID(0);} catch (InterruptedException e){} } public void paintComponent(Graphics g) { super.paintComponent(g); g.drawImage(image,0,0,this); } private Image image; }

62. “ 640K ought to be enough for anybody.” --Bill Gates, 1981

63. Nu inschrijven voor het schaaktoernooi