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+@startuml
+title Factory Method パターン（DocumentCreator）
+
+interface Document {
+    + void open()
+}
+
+class WordDocument implements Document {
+    + void open()
+}
+
+class PdfDocument implements Document {
+    + void open()
+}
+
+abstract class DocumentCreator {
+    # abstract Document createDocument()
+    + void openDocument()
+}
+
+class WordCreator extends DocumentCreator {
+    + Document createDocument()
+}
+
+class PdfCreator extends DocumentCreator {
+    + Document createDocument()
+}
+
+// 継承関係
+DocumentCreator <|-- WordCreator
+DocumentCreator <|-- PdfCreator
+
+// 実装関係
+Document <|.. WordDocument
+Document <|.. PdfDocument
+
+// 利用関係（生成）
+DocumentCreator --> Document : createDocument()
+
+@enduml