diff -r 000000000000 -r 959103a6100f src/share/classes/com/sun/tools/javac/parser/Parser.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/classes/com/sun/tools/javac/parser/Parser.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 1999, 2008, 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.
+ */
+
+
+package com.sun.tools.javac.parser;
+
+import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
+import com.sun.tools.javac.tree.JCTree.JCExpression;
+import com.sun.tools.javac.tree.JCTree.JCStatement;
+
+/**
+ * Reads syntactic units from source code.
+ * Parsers are normally created from a ParserFactory.
+ *
+ * <p><b>This is NOT part of any supported API.
+ * If you write code that depends on this, you do so at your own risk.
+ * This code and its internal interfaces are subject to change or
+ * deletion without notice.</b>
+ */
+public interface Parser {
+    /**
+     * Parse a compilation unit.
+     * @return a compilation unit
+     */
+    JCCompilationUnit parseCompilationUnit();
+
+    /**
+     * Parse an expression.
+     * @return an expression
+     */
+    JCExpression parseExpression();
+
+    /**
+     * Parse a statement.
+     * @return an expression
+     */
+    JCStatement parseStatement();
+
+    /**
+     * Parse a type.
+     * @return an expression for a type
+     */
+    JCExpression parseType();
+}