Add chapters 9-17 for the java book

Java-Kompendium/kap8/Task3.java

@@ -0,0 +1,21 @@
+import java.io.*;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Task3 {
+    public static void main(String[] arguments) throws IOException {
+        var friends = new HashMap<String, Integer>();
+
+        friends.put("Maximilian Mayer", 20);
+        friends.put("Emil Faber", 30);
+        friends.put("Anna Müller", 45);
+        friends.put("Sebastian Waller", 39);
+        friends.put("Oliver Stilz", 25);
+
+        for (Map.Entry<String, Integer> name: friends.entrySet()) {
+            System.out.print(name.getKey());
+            System.out.print(": ");
+            System.out.println(name.getValue());
+        }
+    }
+}