implemented composite pattern

src/uebung08/doc/Book.java

@@ -0,0 +1,37 @@
+package uebung08.doc;
+
+import java.util.List;
+
+public class Book {
+
+    private String title;
+    private String author;
+
+    List<TextComponent> content;
+
+    public Book(String author, String title, List<TextComponent> content) {
+        this.author = author;
+        this.title = title;
+        this.content = content;
+    }
+
+    public int countWords() {
+        int wordcount = 0;
+        for (TextComponent textComponent : content) {
+            wordcount += textComponent.countWords();
+        }
+        return wordcount;
+    }
+
+    public String toText() {
+        return "";
+    }
+
+    public String tableOfContents() {
+        return "";
+    }
+
+    public int countWordsByVisitor() {
+        return 0;
+    }
+}