146 lines
4.3 KiB
Java
146 lines
4.3 KiB
Java
/*
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* Copyright (c) 2011, 2013, 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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/*
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* @test
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* @bug 8003280
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* @summary Add lambda tests
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* basic test for lambda conversion
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* @author Brian Goetz
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* @author Maurizio Cimadamore
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* @run main LambdaConv01
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*/
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public class LambdaConv01 {
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static int assertionCount = 0;
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static void assertTrue(boolean cond) {
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assertionCount++;
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if (!cond)
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throw new AssertionError();
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}
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interface IntToInt {
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public int foo(int x);
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}
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interface IntToVoid {
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public void foo(int x);
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}
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interface VoidToInt {
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public int foo();
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}
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interface TU<T, U> {
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public T foo(U u);
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}
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public static <T, U> T exec(TU<T, U> lambda, U x) {
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return lambda.foo(x);
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}
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static {
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//Assignment conversion:
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VoidToInt f1 = ()-> 3;
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assertTrue(3 == f1.foo());
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//Covariant returns:
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TU<Number, Integer> f2 = (Integer x) -> x;
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assertTrue(3 == f2.foo(3).intValue());
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//Method resolution with boxing:
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int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);
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assertTrue(3 == res);
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//Runtime exception transparency:
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try {
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LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);
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}
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catch (RuntimeException e) {
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assertTrue(true);
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}
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}
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{
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//Assignment conversion:
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VoidToInt f1 = ()-> 3;
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assertTrue(3 == f1.foo());
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//Covariant returns:
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TU<Number, Integer> f2 = (Integer x) -> x;
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assertTrue(3 == f2.foo(3).intValue());
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//Method resolution with boxing:
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int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);
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assertTrue(3 == res);
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//Runtime exception transparency:
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try {
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LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);
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}
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catch (RuntimeException e) {
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assertTrue(true);
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}
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}
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public static void test1() {
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//Assignment conversion:
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VoidToInt f1 = ()-> 3;
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assertTrue(3 == f1.foo());
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//Covariant returns:
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TU<Number, Integer> f2 = (Integer x) -> x;
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assertTrue(3 == f2.foo(3).intValue());
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//Method resolution with boxing:
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int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);
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assertTrue(3 == res);
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//Runtime exception transparency:
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try {
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LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);
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}
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catch (RuntimeException e) {
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assertTrue(true);
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}
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}
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public void test2() {
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//Assignment conversion:
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VoidToInt f1 = ()-> 3;
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assertTrue(3 == f1.foo());
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//Covariant returns:
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TU<Number, Integer> f2 = (Integer x) -> x;
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assertTrue(3 == f2.foo(3).intValue());
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//Method resolution with boxing:
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int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);
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assertTrue(3 == res);
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//Runtime exception transparency:
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try {
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LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);
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}
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catch (RuntimeException e) {
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assertTrue(true);
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}
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}
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public static void main(String[] args) {
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test1();
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new LambdaConv01().test2();
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assertTrue(assertionCount == 16);
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}
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}
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