--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/FinalFieldTest.java	Tue Dec 18 15:33:55 2012 +0100
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2012, 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.
+ *
+ * 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.
+ */
+package com.oracle.truffle.api.test;
+
+import org.junit.*;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+
+/**
+ * <h3>Using Final Fields in Node Classes</h3>
+ *
+ * <p>
+ * The usage of final fields in node classes is highly encouraged. It is beneficial for performance to declare every
+ * field that is not pointing to a child node as final. This gives the Truffle runtime an increased opportunity to
+ * optimize this node.
+ * </p>
+ *
+ * <p>
+ * If a node has a value which may change at run time, but will rarely do so, it is recommended to speculate on the
+ * field being final. This involves starting executing with a node where this field is final and only if this
+ * turns out to be no longer the case, the node is replaced with an alternative implementation of the operation (see
+ * {@link ReplaceTest}).
+ * </p>
+ *
+ * <p>
+ * The next part of the Truffle API introduction is at {@link com.oracle.truffle.api.test.ReplaceTest}.
+ * </p>
+ */
+public class FinalFieldTest {
+
+    @Test
+    public void test() {
+        TruffleRuntime runtime = Truffle.getRuntime();
+        TestRootNode rootNode = new TestRootNode(new TestChildNode[]{new TestChildNode(20), new TestChildNode(22)});
+        CallTarget target = runtime.createCallTarget(rootNode);
+        Object result = target.call();
+        Assert.assertEquals(42, result);
+    }
+
+    class TestRootNode extends RootNode {
+
+        @Children TestChildNode[] children;
+
+        public TestRootNode(TestChildNode[] children) {
+            this.children = adoptChildren(children);
+        }
+
+        @Override
+        public Object execute(VirtualFrame frame) {
+            int sum = 0;
+            for (int i = 0; i < children.length; ++i) {
+                sum += children[i].execute();
+            }
+            return sum;
+        }
+    }
+
+    class TestChildNode extends Node {
+        private final int value;
+
+        public TestChildNode(int value) {
+            this.value = value;
+        }
+
+        public int execute() {
+            return value;
+        }
+    }
+}
+