--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/vmTestbase/vm/runtime/defmeth/shared/builder/InterfaceBuilder.java	Wed May 23 17:09:49 2018 -0700
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2013, 2018, 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 vm.runtime.defmeth.shared.builder;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import vm.runtime.defmeth.shared.data.Interface;
+import vm.runtime.defmeth.shared.data.InterfaceImpl;
+import vm.runtime.defmeth.shared.data.method.Method;
+
+/**
+ * Builder for Interface instances.
+ */
+public class InterfaceBuilder extends ClassBuilder<InterfaceBuilder,Interface> {
+
+    // Superinterfaces
+    private List<Interface> parents = new ArrayList<>();
+
+    /* package-private */ InterfaceBuilder(TestBuilder builder) {
+        super(builder);
+    }
+
+    public InterfaceBuilder extend(Interface... intf) {
+        parents.addAll(Arrays.asList(intf));
+
+        return this;
+    }
+
+    public ClassMethodBuilder<InterfaceBuilder> defaultMethod(String name, String desc) {
+        MethodBuilder mb = builder.method().name(name).desc(desc).type(MethodType.DEFAULT);
+        return new ClassMethodBuilder<>(this, mb);
+    }
+
+    public ClassMethodBuilder<InterfaceBuilder> abstractMethod(String name, String desc) {
+        MethodBuilder mb = builder.method().name(name).desc(desc).type(MethodType.ABSTRACT);
+        return new ClassMethodBuilder<>(this, mb);
+    }
+
+    /**
+     * Construct Data.Interface instance.
+     * @return instance of Data.Interface class
+     */
+    @Override
+    public Interface build() {
+        if (name == null) {
+            throw new IllegalStateException();
+        }
+
+        Interface intf = new InterfaceImpl(flags, name, majorVer, sig, parents.toArray(new Interface[0]),
+                methods.toArray(new Method[0]));
+
+        if (builder.hasElement(name)) {
+            throw new IllegalStateException();
+        }
+
+        builder.register(intf);
+        builder.finishConstruction(this);
+
+        return intf;
+    }
+}