| /* |
| * Copyright (c) 2013, 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. |
| */ |
| |
| /** |
| * @test |
| * @bug 8028739 |
| * @summary javac generates incorrect descriptor for MethodHandle::invoke |
| * @run testng MethodReferenceTestMethodHandle |
| */ |
| |
| import java.lang.invoke.*; |
| import java.util.*; |
| |
| import org.testng.annotations.Test; |
| import static org.testng.Assert.assertEquals; |
| |
| @Test |
| public class MethodReferenceTestMethodHandle { |
| |
| MethodHandles.Lookup lookup = MethodHandles.lookup(); |
| |
| interface ReplaceItf { |
| Object apply(String a, char b, char c) throws Throwable; |
| } |
| |
| interface FormatItf { |
| Object apply(String a, Object... args) throws Throwable; |
| } |
| |
| interface AddItf { |
| void apply(List st, int idx, Object v) throws Throwable; |
| } |
| |
| public void testVirtual() throws Throwable { |
| |
| MethodType mt = MethodType.methodType(String.class, char.class, char.class); |
| MethodHandle ms = lookup.findVirtual(String.class, "replace", mt); |
| |
| // --- String.replace(String, char, char) --- |
| |
| assertEquals("oome otring to oearch", ms.invoke("some string to search", 's', 'o')); |
| |
| ReplaceItf f1 = (a, b, c) -> ms.invoke(a,b,c); |
| assertEquals("oome otring to oearch", f1.apply("some string to search", 's', 'o')); |
| |
| ReplaceItf f2 = ms::invoke; |
| assertEquals("oome otring to oearch", f2.apply("some string to search", 's', 'o')); |
| assertEquals("oome otring to oearch", f2.apply("some string to search", new Character('s'), 'o')); |
| assertEquals("oome otring to oearch", ((ReplaceItf) ms::invoke).apply("some string to search", 's', 'o')); |
| } |
| |
| public void testStatic() throws Throwable { |
| MethodType fmt = MethodType.methodType(String.class, String.class, (new Object[1]).getClass()); |
| MethodHandle fms = lookup.findStatic(String.class, "format", fmt); |
| |
| // --- String.format(String, Object...) --- |
| |
| assertEquals("Testing One 2 3", fms.invoke("Testing %s %d %x", "One", new Integer(2), 3)); |
| |
| FormatItf ff2 = fms::invoke; |
| assertEquals("Testing One 2 3", ff2.apply("Testing %s %d %x", "One", new Integer(2), 3)); |
| assertEquals("Testing One 2 3", ((FormatItf) fms::invoke).apply("Testing %s %d %x", "One", new Integer(2), 3)); |
| assertEquals("Testing One 2 3 four", ff2.apply("Testing %s %d %x %s", "One", new Integer(2), 3, "four")); |
| } |
| |
| public void testVoid() throws Throwable { |
| MethodType pmt = MethodType.methodType(void.class, int.class, Object.class); |
| MethodHandle pms = lookup.findVirtual(List.class, "add", pmt); |
| List<String> list = new ArrayList<>(); |
| |
| // --- List.add(int,String) --- |
| |
| pms.invoke(list, 0, "Hi"); |
| |
| AddItf pf2 = pms::invoke; |
| pf2.apply(list, 1, "there"); |
| AddItf pf3 = pms::invokeExact; |
| pf3.apply(list, 2, "you"); |
| assertEquals("Hi", list.get(0)); |
| assertEquals("there", list.get(1)); |
| assertEquals("you", list.get(2)); |
| } |
| } |