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diff --git a/examples_java/src/collections/ship/basic/PartKey.java b/examples_java/src/collections/ship/basic/PartKey.java
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+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 2002-2009 Oracle.  All rights reserved.
+ *
+ * $Id$
+ */
+
+package collections.ship.basic;
+
+import java.io.Serializable;
+
+/**
+ * A PartKey serves as the key in the key/data pair for a part entity.
+ *
+ * <p> In this sample, PartKey is used both as the storage entry for the key as
+ * well as the object binding to the key.  Because it is used directly as
+ * storage data using serial format, it must be Serializable. </p>
+ *
+ * @author Mark Hayes
+ */
+public class PartKey implements Serializable {
+
+    private String number;
+
+    public PartKey(String number) {
+
+        this.number = number;
+    }
+
+    public final String getNumber() {
+
+        return number;
+    }
+
+    public String toString() {
+
+        return "[PartKey: number=" + number + ']';
+    }
+}