7. Vorlesung - Institut für Informatik

Verteilte Software - Java - Grafik - Ereignisse 1
java.lang.Object
java.awt.Applet
java.awt.Frame
javax.swing.JFrame
javax.swing.JApplet
java.awt.Window
java.awt.Dialog
javax.swing.JWindow
javax.swing.JDialog
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 2
java.awt.Window
addWindowListener()
1
<<uses>>
java.awt.Frame
<<interface>>
Runnable
run()
1
Head
1
1
Smile
<<interface>>
WindowListener
windowActivated()
windowClosed()
windowClosing()
windowDeactivated()
windowDeiconified()
windowIconified()
windowOpened()
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 3
import java.awt.*;
import java.awt.event.*;
public class Smile
{ public static void main( String argv[] )
{ Frame f = new Head();
f.setTitle( "Smile" );
f.setSize( 400, 400 );
f.setVisible(true);
f.addWindowListener((WindowListener)f);
}
}
class Head extends Frame implements Runnable, WindowListener
{ private Thread blink, blinkFinished;
boolean auf;
Head()
{ auf = true;
blink = blinkFinished = new Thread(this);
blink.start();
}
public void paint( Graphics g )
{ auf = !auf;
g.setColor( Color.blue );
g.drawOval( 50, 50, 300, 300 );
g.drawOval( 100, 120, 80, 80 );
if (auf) g.drawOval( 220, 120, 80, 80 ); else g.drawLine( 220, 160, 300, 160 );
g.drawArc ( 100, 200, 200, 100, -20, -140 );
g.drawLine( 200, 200, 200, 230);
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 4
public void run()
{ while (blink == blinkFinished)
{ try {blink.sleep((int)(1000.0 * Math.random()));}
catch (InterruptedException e) { System.out.println(e); }
repaint();
}
}
public void windowOpened(WindowEvent e) {}
public void windowActivated(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}
public void windowIconified(WindowEvent e) { blink = null; }
public void windowDeiconified(WindowEvent e)
{
blink = blinkFinished = new Thread(this);
blink.start();
}
public void windowClosing(WindowEvent e)
{
blink = null;
try {blinkFinished.join();}
catch (InterruptedException ie) {System.out.println(ie);}
setVisible(false);
dispose();
System.exit(0);
}
public void windowClosed(WindowEvent e) {}
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 5
java.awt.Window
addWindowListener()
java.awt.Frame
<<interface>>
Runnable
1
<<uses>>
1
SmileHead
1
1
SHWindowListener
windowClosing()
WindowAdapter
<<interface>>
WindowListener
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 6
import java.awt.*;
import java.awt.event.*;
public void paint( Graphics g )
{ auf = !auf; g.setColor( Color.blue );
g.drawOval( 50, 50, 300, 300 );
g.drawOval( 100, 120, 80, 80 );
if (auf) g.drawOval( 220, 120, 80, 80 );
else g.drawLine( 220, 160, 300, 160 );
g.drawArc ( 100, 200, 200, 100, -20, -140);
g.drawLine( 200, 200, 200, 230);
}
public void run()
{ while (blink == blinkFinished)
{ try {blink.sleep((int)(1000.0* Math.random()));}
catch (InterruptedException e)
System.out.println(e);}
repaint();
}
}
class SHWindowListener extends WindowAdapter
{ public void windowClosing(WindowEvent e)
{ blink = null;
try {blinkFinished.join();}
catch (InterruptedException ie)
{System.out.println(ie);}
setVisible(false);
dispose();
System.exit(0);
}
}
class SmileHead extends Frame
implements Runnable
{
private Thread blink,
blinkFinished;
boolean auf;
public static void
main(String argv[])
{
new SmileHead();
}
SmileHead()
{
setTitle( "Smile" );
setSize( 400, 400 );
setVisible(true);
addWindowListener(
new SHWindowListener() );
auf = true;
blink = blinkFinished =
new Thread(this);
blink.start();
}
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 7
import java.awt.*;
import java.awt.event.*;
class Text extends Frame
{
Font
foSs, foMs, foSe;
FontMetrics fmSs, fmMs, fmSe;
String sHead = "TU Bergakademie Freiberg",
sFak = "Fakultät ",
sInf = "Ein Studium in Freiberg lohnt sich";
int i, xa, ya;
public static void main( String argv[] ) { new Text(); }
Text()
{
setTitle( "TU Bergakademie Freiberg" );
setSize( 600, 450 );
setVisible(true);
addWindowListener
(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{
setVisible(false);
dispose();
System.exit(0);
}
} );
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 8
public void paint( Graphics g )
{
foSs = new Font( "SansSerif", Font.PLAIN, 36 ); // Helvetica
foMs = new Font( "Monospaced", Font.BOLD, 24 ); // Courier
foSe = new Font( "Serif", Font.ITALIC, 18 );
// TimesRoman
fmSs = g.getFontMetrics( foSs );
fmMs = g.getFontMetrics( foMs );
fmSe = g.getFontMetrics( foSe );
g.setColor( Color.blue );
xa = (getBounds().width - fmSs.stringWidth(sHead)) / 2;
g.setFont(foSs);
g.drawString(sHead, xa, 2 * fmSs.getHeight());
g.setFont(foMs);
g.setColor( Color.black );
ya = 4 * fmSs.getHeight();
xa = 50;
for (i = 1; i < 7; i++)
{
g.drawString(sFak + i, xa, ya);
ya += fmMs.getHeight();
}
g.setColor( Color.darkGray);
g.setFont(foSe);
xa = (getBounds().width - fmSe.stringWidth(sInf) - 50);
ya += (3 * fmSe.getHeight());
g.drawString(sInf, xa, ya);
}
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 9
import java.awt.*;
import java.awt.event.*;
class News extends Frame implements Runnable
{
Font
foSs, foMs, foSe;
FontMetrics fmSs, fmMs, fmSe;
String sHead = "TU Bergakademie Freiberg",
sFak = "Fakultät ",
s0 = " +++ NEWS +++ ",
s1 = "Die Fakultät 1 plant für das nächste Studienjahr, ...",
s2 = "Ein Besuch der TU Bergakademie Freiberg lohnt sich immer.";
Image
bI;
Graphics bG;
Thread moveThread, moveThreadFinished;
int i,
xa,
ya,
breit,
hoch,
pos,
rand;
public static void main( String argv[] ) {new News();}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 10
News()
{ pos = 100; rand = 50;
bI = null;
foSs = new Font( "SansSerif", Font.PLAIN, 30 ); // Helvetica
foMs = new Font( "Monospaced", Font.BOLD, 20 ); // Courier
foSe = new Font( "Serif", Font.ITALIC, 18 );
// TimesRoman
fmSs = getToolkit().getFontMetrics( foSs );
fmMs = getToolkit().getFontMetrics( foMs );
fmSe = getToolkit().getFontMetrics( foSe );
breit = fmSe.stringWidth( s0+s1+s0+s2+s0 );
hoch = fmSe.getHeight();
setBackground( Color.lightGray );
setTitle( "TU Bergakademie Freiberg" );
setSize( 500, 400 );
setVisible(true);
addWindowListener
(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ moveThread = null;
try {moveThreadFinished.join();}
catch (InterruptedException ie) {System.out.println(ie);}
setVisible(false);
dispose();
System.exit(0);
}
} );
moveThread = moveThreadFinished = new Thread(this);
moveThread.start();
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 11
void checksize()
{
if (bI == null ||
getBounds().width
!= bI.getWidth(null) ||
getBounds().height
!= bI.getHeight(null) )
{
bI = createImage
(getBounds().width,
getBounds().height);
bG = bI.getGraphics();
}
}
public void paint( Graphics g )
{
checksize();
if (bG == null) paintD(g);
else
{
paintD(bG);
g.drawImage
(bI, 0, 0, null);
}
}
public void paintD( Graphics g )
{
g.clearRect( 0, 0, getBounds().width,
getBounds().height);
g.clipRect(rand, rand,
getBounds().width - 2 * rand,
getBounds().height - 2 * rand);
g.setColor( Color.blue );
xa = (getBounds().width –
fmSs.stringWidth(sHead)) / 2;
g.setFont(foSs);
g.drawString(sHead, xa, 2 * fmSs.getHeight());
g.setFont(foMs);
g.setColor( Color.black );
ya = 4 * fmSs.getHeight();
xa = 50;
for (i = 1; i < 7; i++)
{ g.drawString(sFak + i, xa, ya);
ya += fmMs.getHeight();
}
g.setFont(foSe);
g.setColor(Color.white);
g.fillRect(0, ya + hoch, getBounds().width,
3 * hoch / 2);
ya += (2 * hoch );
g.setColor(Color.black);
g.drawString(s0+s1+s0+s2+s0, pos, ya);
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 12
public void update(Graphics g)
{
paint(g);
Toolkit.getDefaultToolkit().sync();
}
public void run()
{
while (moveThread == moveThreadFinished)
{
if (pos + breit > rand)
pos--;
else
pos = getBounds().width - rand;
try {moveThread.sleep(50);}
catch (InterruptedException e)
{
System.out.println(e);
}
repaint();
}
}
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 13
import java.awt.*;
import java.awt.event.*;
class SlideShow extends Frame implements Runnable
{
private Thread thread, threadFinished;
Image bilder[];
int i, select, anzahl;
public static void main( String argv[] )
{ new SlideShow(argv[0], Integer.parseInt(argv[1]));
}
SlideShow (String b_name, int anzahl)
{ this.anzahl = anzahl;
select = 0;
bilder = new Image [anzahl];
Toolkit tk = Toolkit.getDefaultToolkit();
System.out.print(anzahl);
System.out.print(" Bilder werden geladen ... ");
System.out.flush();
for (i = 0; i < anzahl; i++)
bilder[i] = tk.getImage( b_name + i + ".gif" );
MediaTracker mt = new MediaTracker( this );
for (i = 0; i < anzahl; i++)
mt.addImage( bilder[i], i );
try { mt.waitForAll(); }
catch ( InterruptedException e ) { return; }
System.out.println( "fertig" );
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 14
setBackground( Color.orange );
setTitle( "SlideShow" );
setSize( 450, 350 );
setVisible(true);
addWindowListener
(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ thread = null;
try {threadFinished.join();}
catch (InterruptedException ie)
{System.out.println(ie);}
setVisible(false);
dispose();
System.exit(0);
public void run()
}
{
} );
while (thread == threadFinished)
thread = threadFinished = new Thread(this);
{
thread.start();
select++;
}
select %= anzahl;
try {thread.sleep(2000);}
public void paint( Graphics g )
catch (InterruptedException e)
{
{
g.drawImage( bilder[select], 50, 70, null );
System.out.println(e);
}
}
repaint();
}
}
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 15
java.lang.Object
<<uses>>
java.awt.Component
java.awt.Container
addMouseListener()
add(Component c)
1
<<interface>>
MouseListener
mousePressed()
mouseReleased()
mouseClicked()
mouseEntered()
mouseExited()
java.awt.Window
java.awt.Canvas
java.awt.Frame
1
Display
1
1
Disp_F
1
1
MButton
<<implements>>
java.awt.event.MouseAdapter
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 16
import java.awt.*;
import java.awt.event.*;
class Display extends Canvas
{
Polygon pf;
int select_f,
phi,
maxy,
mtx,
mty,
i;
Display()
{
this(1, 0);
}
Display(int select_f, int phi)
{
this.select_f = select_f;
this.phi = phi;
maxy = 100;
mtx = 0;
setBackground(Color.black);
new_function();
addMouseListener(new MButton());
}
void new_function()
{ pf = new Polygon();
switch (select_f)
{ case 0:
break;
case 1: case 2: case 3: case 4:
pf.addPoint(20, 2 * maxy);
for (i = 0; i <= 360; i++)
pf.addPoint
(i + 20,
(int)Math.round
(maxy * (2 - fkt(select_f, phi, i))));
pf.addPoint(i + 19, 2 * maxy);
break;
case 5: case 6: case 7: case 8:
for (int i = 0; i <= 360; i++)
pf.addPoint
((int)Math.round
(maxy * (2 - fkt(1, 0, i))),
(int)Math.round
(maxy * (2 - fkt(select_f-4, phi, i))));
break;
}
}
void new_function(int s, int p)
{ select_f = s;
phi = p;
new_function();
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 17
double fkt(int art, int phi, int pos)
{
double fw = 0.0;
switch (art)
{ case 1 :
fw = Math.sin((pos + phi) *
2 * Math.PI / 360 );
break;
case 2 :
fw = Math.sin((2 * pos + phi) *
2 * Math.PI / 360);
break;
case 3 :
fw = Math.sin
((pos + phi) * 2 *
Math.PI / 360) + 1 / 3.0 *
Math.sin(3 * (pos + phi) *
2 * Math.PI / 360);
break;
case 4 :
fw = Math.sin((2 * pos + phi) *
2 * Math.PI / 360)
+ 1 / 3.0 * Math.sin
( 3 * (2 * pos + phi) *
2 * Math.PI / 360);
break;
}
return fw;
}
public void paint( Graphics g )
{ g.setColor( Color.green );
g.drawPolygon( pf );
g.setColor( Color.yellow );
if (mtx > 0)
{ g.drawLine(mtx, maxy / 2,
mtx, 7 * maxy / 2);
g.drawLine(mtx - 10, 2 * maxy - mty,
mtx + 10, 2 * maxy - mty);
g.drawString((new Integer(mty).toString()),
mtx+10, maxy / 2);
}
}
public class MButton extends MouseAdapter
{ public void mousePressed(MouseEvent e)
{ int x = e.getX() - 20;
if ( 0 <= x && x <= 360 &&
0 < select_f && select_f < 5)
{ mtx = x + 20; mty = (int)Math.round
(maxy * fkt(select_f, phi, x));
}
repaint();
}
public void mouseReleased(MouseEvent e)
{ mtx = 0;
repaint();
}
}
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 18
import java.awt.*;
import java.awt.event.*;
public class Disp_F extends Frame
{ /* Test der Klasse mit:
Disp_F Auswahl Phase
int Auswahl 1..8
(1..4 Zeitfunktion 5..8 Lissajous-Figuren)
int Phase
0..360 (Phasenwinkel in Grad)
*/
public static void main( String argv[] ) { new Disp_F(argv); }
Disp_F( String argv[] )
{ add(new Display(Integer.parseInt(argv[0]), Integer.parseInt(argv[1])));
setTitle("Display Function");
setSize( 420, 400 );
setVisible(true);
addWindowListener
(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ setVisible(false);
dispose();
System.exit(0);
}
} );
}
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 19
java.lang.Object
<<implements>>
<<interface>>
ActionListener
java.awt.Component
actionPerformed()
java.awt.Container
add(Component c)
<<interface>>
AdjustmentListener
java.awt.Window
AdjustmentValueChanged()
java.awt.Frame
1
Oszilloscop
1
1
Display
<<interface>>
ItemListener
itemStateChanged()
java.awt.Button
1
addActionListener()
5
<<uses>>
java.awt.Scrollbar
1
addAdjustmentListener()
1
<<uses>>
java.awt.Checkbox
1
addItemListener()
1
<<interface>>
TextListener
textValueChanged()
java.awt.Canvas
<<uses>>
<<uses>>
java.awt.TextField
1
addActionListener()
1
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 20
import java.awt.*;
import java.awt.event.*;
public class Oszilloscop extends Frame
implements ActionListener,
ItemListener,
TextListener,
AdjustmentListener
{ Display
disp;
Scrollbar sb;
Checkbox cb;
TextField tf;
Button b[] = new Button[5];
int phi,
fw,
art;
public static void main(String argv[])
{
new Oszilloscop();
}
Oszilloscop ()
{
int i;
phi = 0;
fw = 1;
art = 0;
setBackground(Color.lightGray);
setLayout(new BorderLayout());
// oben
Panel oben = new Panel();
oben.setLayout
(new FlowLayout(FlowLayout.CENTER));
b[0] = new Button("
sin( x)
");
b[1] = new Button("
sin(2x)
");
b[2] = new Button("sin( x) + 1/3 sin(3x)");
b[3] = new Button("sin(2x) + 1/3 sin(6x)");
for ( i = 0; i <= 3; i++)
{
b[i].addActionListener(this);
oben.add(b[i]);
}
add(oben, BorderLayout.NORTH);
//links
Panel links = new Panel();
b[4] = new Button("Aus");
b[4].addActionListener(this);
links.add(b[4]);
add(links, BorderLayout.WEST);
//zentral
disp = new Display();
add(disp, BorderLayout.CENTER );
//rechts
sb = new Scrollbar
(Scrollbar.VERTICAL, 0, 20, 0, 380);
sb.addAdjustmentListener(this);
sb.setUnitIncrement(3);
sb.setBlockIncrement(30);
add(sb, BorderLayout.EAST);
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 21
//unten
Panel unten = new Panel();
cb = new Checkbox("Lissajous");
cb.addItemListener(this);
unten.add(cb);
unten.add(new Label("Phasenwinkel"));
tf = new TextField("0",3);
tf.addTextListener(this);
unten.add(tf);
unten.add(new Label("°"));
add(unten, BorderLayout.SOUTH);
setBackground(Color.lightGray);
setTitle("Oszilloscop");
setSize (600,500);
setVisible(true);
addWindowListener
(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{
setVisible(false);
dispose();
System.exit(0);
}
} );
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 22
public void actionPerformed(ActionEvent e)
{
Object obj = e.getSource();
String arg = e.getActionCommand();
if (obj instanceof Button)
{
if (arg.equals("
sin( x)
"))
fw = 1;
if (arg.equals("
sin(2x)
"))
fw = 2;
if (arg.equals("sin( x) + 1/3 sin(3x)"))
fw = 3;
if (arg.equals("sin(2x) + 1/3 sin(6x)"))
fw = 4;
if (arg.equals("Aus"))
{ fw = 0;
art = 0;
phi = 0;
public void itemStateChanged(ItemEvent e)
tf.setText("0");
{
sb.setValue(phi);
Object obj = e.getSource();
cb.setState(false);
if (obj == cb)
}
{
disp_new();
if (cb.getState()) art = 4;
}
else art = 0;
}
if (fw != 0) disp_new();
}
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 23
public void textValueChanged(TextEvent e)
{
Object obj = e.getSource();
if (obj == tf)
{
phi = Integer.parseInt(tf.getText());
if (phi < 0) phi = 0;
if (phi > 360) phi = 360;
sb.setValue(phi);
disp_new();
}
}
public void adjustmentValueChanged(AdjustmentEvent e)
{
Object obj = e.getSource();
if (obj == sb)
{
phi = sb.getValue();
disp_new();
tf.setText(new Integer(phi).toString());
}
}
void disp_new()
{
disp.new_function(art + fw, phi);
disp.repaint();
}
}
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 24
Ereignis
Listener
Methoden
Quelle
ActionEvent
ActionListener
actionPerformd
Button
List
MenuItem
TextField
AdjustmentEvent
AdjustmentListener
adjustmentValueChanged
ScrollBar
ComponentEvent
ComponentListener
componentHidden
componentMoved
componentResized
componentShown
Component
ContainerEvent
ContainerListener
componentAdded
Container
FocusEvent
FocusListener
focusGained
focusLost
Component
ItemEvent
ItemListener
itemStateChanged
CheckBox
Choice
List
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik
Verteilte Software - Java - Grafik - Ereignisse 25
Ereignis
Listener
Methoden
Quelle
KeyEvent
KeyListener
keyPressed
keyReleased
keyTyped
Component
MouseEvent
MouseListener
mouseClicked
mouseEntered
mouseExited
mousePressed
mouseReleased
Component
MouseEvent
MouseMotionListener
mouseDragged
MouseMoved
Component
TextEvent
TextListener
textValueChanged
TextComponent
WindowEvent
WindowListener
windowActivated
windowClosed
windowClosing
windowDeactivated
windowDeiconified
windowIconified
windowOpened
Window
Prof. Dr.-Ing. habil. B. Steinbach - Informatik / Softwaretechnologie und Programmierungstechnik - Institut für Informatik