--- /dev/null	2019-02-07 20:54:51.336000000 +0300
+++ new/test/lib/jdk/test/lib/hprof/model/JavaThing.java	2019-02-08 18:34:08.006959584 +0300
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+/*
+ * The Original Code is HAT. The Initial Developer of the
+ * Original Code is Bill Foote, with contributions from others
+ * at JavaSoft/Sun.
+ */
+
+package jdk.test.lib.hprof.model;
+
+import java.util.Enumeration;
+import java.util.Hashtable;
+
+
+/**
+ *
+ * @author      Bill Foote
+ */
+
+
+/**
+ * Represents a java "Thing".  A thing is anything that can be the value of
+ * a field.  This includes JavaHeapObject, JavaObjectRef, and JavaValue.
+ */
+
+public abstract class JavaThing {
+
+    protected JavaThing() {
+    }
+
+    /**
+     * If this is a forward reference, figure out what it really
+     * refers to.
+     *
+     * @param snapshot  The snapshot this is for
+     * @param field     The field this thing represents.  If null, it is
+     *                  assumed this thing is an object (and never a value).
+     */
+    public JavaThing dereference(Snapshot shapshot, JavaField field) {
+        return this;
+    }
+
+
+    /**
+     * Are we the same type as other?
+     *
+     * @see JavaObject.isSameTypeAs()
+     */
+    public boolean isSameTypeAs(JavaThing other) {
+        return getClass() == other.getClass();
+    }
+    /**
+     * @return true iff this represents a heap-allocated object
+     */
+    abstract public boolean isHeapAllocated();
+
+    /**
+     * @return the size of this object, in bytes, including VM overhead
+     */
+    abstract public long getSize();
+
+    /**
+     * @return a human-readable string representation of this thing
+     */
+    abstract public String toString();
+
+    /**
+     * Compare our string representation to other's
+     * @see java.lang.String.compareTo()
+     */
+    public int compareTo(JavaThing other) {
+        return toString().compareTo(other.toString());
+    }
+
+}