1 /*

        2  * Copyright 2010 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

       20  * CA 95054 USA or visit www.sun.com if you need additional information or

       21  * have any questions.

       22  */

       23 

       24 /*

       25  * @test

       26  * @summary basic test for capture of non-mutable locals

       27  * @author  Brian Goetz

       28  * @author  Maurizio Cimadamore

       29  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles LambdaScope01

       30  */

       31 

       32 public class LambdaScope01 {

       33 

       34     static int assertionCount = 0;

       35 

       36     static void assertTrue(boolean cond) {

       37         assertionCount++;

       38         if (!cond)

       39             throw new AssertionError();

       40     }

       41 

       42     interface TU<T, U> {

       43         public T foo(U u);

       44     }

       45 

       46     public static <T, U> T exec(TU<T, U> lambda, U x) {

       47         return lambda.foo(x);

       48     }

       49 

       50     public int n = 5;

       51 

       52     public int hashCode() {

       53         throw new RuntimeException();

       54     }

       55 

       56     public void test1() {

       57         int x = LambdaScope01.<Integer,Integer>exec(#(Integer x)(x * hashCode()), 3);

       58         assertTrue(true); //should not throw

       59     }

       60 

       61     public void test2() {

       62         final int n = 10;

       63         int x = LambdaScope01.<Integer,Integer>exec(#(Integer x)(x + n), 3);

       64         assertTrue(13 == x);

       65     }

       66 

       67     public static void main(String[] args) {

       68         LambdaScope01 t = new LambdaScope01();

       69         t.test1();

       70         t.test2();

       71         assertTrue(assertionCount == 2);

       72     }

       73 }