Finish Java Kompendium book

Java-Kompendium/kap22/Task1.java

@@ -0,0 +1,16 @@
+import java.util.List;
+
+public class Task1 {
+    private <T> void f(List<T> list) {
+        if (list.size() > 1) {
+            var swap = list.get(0);
+            var lastIndex = list.size() - 1;
+
+            list.set(0, list.get(lastIndex));
+            list.set(lastIndex, swap);
+        }
+    }
+
+    public static void main(String[] arguments) {
+    }
+}