Add chapters 9-17 for the java book

Java-Kompendium/kap11/Task1.java

@@ -0,0 +1,20 @@
+import javax.swing.JOptionPane;
+
+public class Task1 {
+    public static void main(String[] arguments) {
+        var result = JOptionPane.showConfirmDialog(null,
+                "Bestätigen Sie die Eingabe", "Bestätigung", JOptionPane.YES_NO_CANCEL_OPTION);
+
+        switch (result) {
+            case JOptionPane.YES_OPTION:
+                JOptionPane.showMessageDialog(null, "Ja");
+                break;
+            case JOptionPane.NO_OPTION:
+                JOptionPane.showMessageDialog(null, "Nein");
+                break;
+            case JOptionPane.CANCEL_OPTION:
+                JOptionPane.showMessageDialog(null, "Abbrechen");
+                break;
+        }
+    }
+}