1 files changed, 99 insertions, 0 deletions
diff --git a/Master/Reference Architectures and Patterns/hjp5/examples/LightBulb.java b/Master/Reference Architectures and Patterns/hjp5/examples/LightBulb.java
new file mode 100644
index 0000000..961fef3
--- /dev/null
+++ b/Master/Reference Architectures and Patterns/hjp5/examples/LightBulb.java
@@ -0,0 +1,99 @@
+/* LightBulb.java */
+
+import java.awt.*;
+import java.awt.event.*;
+import java.io.*;
+import java.beans.*;
+
+public class LightBulb
+extends Canvas
+implements Serializable
+{
+  //Instanzvariablen
+  protected boolean lighton;
+  transient protected Image offimage;
+  transient protected Image onimage;
+
+  //Methoden
+  public LightBulb()
+  {
+    lighton = false;
+    initTransientState();
+  }
+
+  //Getter/Setter Licht an/aus
+  public void setLightOn(boolean on)
+  {
+    if (on != this.lighton) {
+      this.lighton = on;
+      repaint();
+    }
+  }
+
+  public boolean getLightOn()
+  {
+    return this.lighton;
+  }
+
+  public void toggleLight()
+  {
+    setLightOn(!getLightOn());
+  }
+
+  //Implementierung der Oberfläche
+  public void paint(Graphics g)
+  {
+    int width = getSize().width;
+    int height = getSize().height;
+    int xpos = 0;
+    if (width > 40) {
+      xpos = (width - 40) / 2;
+    }
+    int ypos = 0;
+    if (height > 40) {
+      ypos = (height - 40) / 2;
+    }
+    g.drawImage(
+      (this.lighton ? onimage : offimage),
+      xpos,
+      ypos,
+      this
+    );
+  }
+
+  public Dimension getPreferredSize()
+  {
+    return new Dimension(40, 40);
+  }
+
+  public Dimension getMinimumSize()
+  {
+    return new Dimension(40, 40);
+  }
+
+  //Private Methoden
+  private void initTransientState()
+  {
+    offimage = getImageResource("bulb1.gif");
+    onimage  = getImageResource("bulb2.gif");
+  }
+
+  private void readObject(ObjectInputStream stream)
+  throws IOException, ClassNotFoundException
+  {
+    stream.defaultReadObject();
+    initTransientState();
+  }
+
+  private Image getImageResource(String name)
+  {
+    Image img = null;
+    try {
+      java.net.URL url = getClass().getResource(name);
+      img = getToolkit().createImage(url);
+    } catch (Exception e) {
+      System.err.println(e.toString());
+    }
+    return img;
+  }
+}
+\ No newline at end of file