russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
79 lines
2.8 KiB
Java
79 lines
2.8 KiB
Java
/*
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* Copyright (c) 2022, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package p1;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandleProxies;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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import java.util.Arrays;
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import java.util.stream.Collectors;
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import p2.TestIntf;
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import static org.junit.jupiter.api.Assertions.*;
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import org.junit.jupiter.api.Test;
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public class Main {
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public interface A {
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default String aConcat(Object... objs) { return Arrays.deepToString(objs); }
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}
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public interface B {
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default String bConcat(Object[] objs) { return Arrays.deepToString(objs); }
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}
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public interface C extends A, B {
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String c(Object... objs);
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}
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private static String concat(Object... objs) {
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return Arrays.stream(objs).map(Object::toString).collect(Collectors.joining());
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}
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/*
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* Test the invocation of default methods with varargs
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*/
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@Test
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public void testVarargsMethods() throws Throwable {
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MethodHandle target = MethodHandles.lookup().findStatic(Main.class,
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"concat", MethodType.methodType(String.class, Object[].class));
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C proxy = MethodHandleProxies.asInterfaceInstance(C.class, target);
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assertEquals("abc", proxy.c("a", "b", "c"));
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assertEquals("[a, b, c]", proxy.aConcat("a", "b", "c"));
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assertEquals("[a, b, c]", proxy.aConcat(new Object[] { "a", "b", "c" }));
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assertEquals("[a, b, c]", proxy.bConcat(new Object[] { "a", "b", "c" }));
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}
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/*
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* Test the invocation of a default method of an accessible interface
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*/
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@Test
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public void modulePrivateInterface() {
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MethodHandle target = MethodHandles.constant(String.class, "test");
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TestIntf t = MethodHandleProxies.asInterfaceInstance(TestIntf.class, target);
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assertEquals("test", t.test());
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}
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}
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