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test/tools/javac/lambda/MethodReference59.java@c09b7234cded (annotated)

test/tools/javac/lambda/MethodReference59.java

Tue, 14 May 2013 11:11:09 -0700

author

rfield

date

Tue, 14 May 2013 11:11:09 -0700

changeset 1752

c09b7234cded

parent 1496

f785dcac17b7

child 2227

998b10c43157

permissions

-rw-r--r--

8012556: Implement lambda methods on interfaces as static
8006140: Javac NPE compiling Lambda expression on initialization expression of static field in interface
Summary: Lambdas occurring in static contexts or those not needing instance information should be generated into static methods. This has long been the case for classes. However, as a work-around to the lack of support for statics on interfaces, interface lambda methods have been generated into default methods. For lambdas in interface static contexts (fields and static methods) this causes an NPE in javac because there is no 'this'. MethodHandles now support static methods on interfaces. This changeset allows lambda methods to be generated as static interface methods. An existing bug in Hotspot (8013875) is exposed in a test when the "-esa" flag is used. This test and another test that already exposed this bug have been marked with @ignore.
Reviewed-by: mcimadamore

mcimadamore@1496	1	/*
mcimadamore@1496	2	* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
mcimadamore@1496	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
mcimadamore@1496	4	*
mcimadamore@1496	5	* This code is free software; you can redistribute it and/or modify it
mcimadamore@1496	6	* under the terms of the GNU General Public License version 2 only, as
mcimadamore@1496	7	* published by the Free Software Foundation.
mcimadamore@1496	8	*
mcimadamore@1496	9	* This code is distributed in the hope that it will be useful, but WITHOUT
mcimadamore@1496	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
mcimadamore@1496	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
mcimadamore@1496	12	* version 2 for more details (a copy is included in the LICENSE file that
mcimadamore@1496	13	* accompanied this code).
mcimadamore@1496	14	*
mcimadamore@1496	15	* You should have received a copy of the GNU General Public License version
mcimadamore@1496	16	* 2 along with this work; if not, write to the Free Software Foundation,
mcimadamore@1496	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
mcimadamore@1496	18	*
mcimadamore@1496	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
mcimadamore@1496	20	* or visit www.oracle.com if you need additional information or have any
mcimadamore@1496	21	* questions.
mcimadamore@1496	22	*/
mcimadamore@1496	23
mcimadamore@1496	24	/*
mcimadamore@1496	25	* @test
mcimadamore@1496	26	* @bug 8004102
mcimadamore@1496	27	* @summary Add support for array constructor references
mcimadamore@1496	28	*/
mcimadamore@1496	29	public class MethodReference59 {
mcimadamore@1496	30
mcimadamore@1496	31	static int assertionCount = 0;
mcimadamore@1496	32
mcimadamore@1496	33	static void assertTrue(boolean cond) {
mcimadamore@1496	34	assertionCount++;
mcimadamore@1496	35	if (!cond)
mcimadamore@1496	36	throw new AssertionError();
mcimadamore@1496	37	}
mcimadamore@1496	38
mcimadamore@1496	39	interface ArrayFactory<X> {
mcimadamore@1496	40	X make(int size);
mcimadamore@1496	41	}
mcimadamore@1496	42
mcimadamore@1496	43	public static void main(String[] args) {
mcimadamore@1496	44	ArrayFactory<int[]> factory1 = int[]::new;
mcimadamore@1496	45	int[] i1 = factory1.make(5);
mcimadamore@1496	46	assertTrue(i1.length == 5);
mcimadamore@1496	47	ArrayFactory<int[][]> factory2 = int[][]::new;
mcimadamore@1496	48	int[][] i2 = factory2.make(5);
mcimadamore@1496	49	assertTrue(i2.length == 5);
mcimadamore@1496	50	assertTrue(assertionCount == 2);
mcimadamore@1496	51	}
mcimadamore@1496	52	}