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