Added source files (Programmieren Tutorium)

presentations/Programmieren-Tutorium/Tutorium-01/Natur-Beispiel/Tree.java

@@ -0,0 +1,24 @@
+public class Tree {
+    /*
+     * Usually, you would use an array for this, but I wanted to keep it simple.
+     */
+
+    /** A leaf of this tree */
+    Leaf leaf1;
+
+    /** Theoretically, you should make those comments over every line */
+    Leaf leaf2;
+    Leaf leaf3;
+    Leaf leaf4;
+    Root mainRoot;
+
+    /** age in years */
+    int age;
+
+    /** name of this tree in English */
+    String name;
+
+    /** scientific name of this type of tree in Latin */
+    String scientificName;
+
+}