1 /* 2 * Copyright (c) 2022, 2024, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @summary Test lambdas with parameter types or return type of value class 27 * @enablePreview 28 * @run junit/othervm LambdaTest 29 */ 30 31 import java.util.function.Function; 32 import java.util.function.IntFunction; 33 34 import jdk.internal.vm.annotation.ImplicitlyConstructible; 35 import jdk.internal.vm.annotation.NullRestricted; 36 import org.junit.jupiter.api.Test; 37 import static org.junit.jupiter.api.Assertions.*; 38 39 public class LambdaTest { 40 @ImplicitlyConstructible 41 static value class V { 42 int x; 43 V(int x) { 44 this.x = x; 45 } 46 47 static V get(int x) { 48 return new V(x); 49 } 50 } 51 52 @ImplicitlyConstructible 53 static value class Value { 54 @NullRestricted 55 V v; 56 Value(V v) { 57 this.v = v; 58 } 59 static Value get(int x) { 60 return new Value(new V(x)); 61 } 62 } 63 64 static int getV(V v) { 65 return v.x; 66 } 67 68 static int getValue(Value v) { 69 return v.v.x; 70 } 71 72 @Test 73 public void testValueParameterType() { 74 Function<Value, Integer> func1 = LambdaTest::getValue; 75 assertTrue(func1.apply(new Value(new V(100))) == 100); 76 77 Function<V, Integer> func2 = LambdaTest::getV; 78 assertTrue(func2.apply(new V(200)) == 200); 79 } 80 81 @Test 82 public void testValueReturnType() { 83 IntFunction<Value> func1 = Value::get; 84 assertEquals(func1.apply(10), new Value(new V(10))); 85 86 IntFunction<V> func2 = V::get; 87 assertEquals(func2.apply(20), new V(20)); 88 } 89 }