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test/tools/javac/lambda/MethodReference01.java@5ddecb91d843 (annotated)

test/tools/javac/lambda/MethodReference01.java

Tue, 12 Mar 2013 16:02:43 +0000

author

mcimadamore

date

Tue, 12 Mar 2013 16:02:43 +0000

changeset 1628

5ddecb91d843

parent 0

959103a6100f

permissions

-rw-r--r--

8009545: Graph inference: dependencies between inference variables should be set during incorporation
Summary: Move all transitivity checks into the incorporation round
Reviewed-by: jjg

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*/
aoqi@0	23
aoqi@0	24	/*
aoqi@0	25	* @test
aoqi@0	26	* @bug 8003280
aoqi@0	27	* @summary Add lambda tests
aoqi@0	28	* use method reference to sort list elements by field
aoqi@0	29	* @author Brian Goetz
aoqi@0	30	* @author Maurizio Cimadamore
aoqi@0	31	* @run main MethodReference01
aoqi@0	32	*/
aoqi@0	33
aoqi@0	34	import java.util.*;
aoqi@0	35
aoqi@0	36	public class MethodReference01 {
aoqi@0	37
aoqi@0	38	interface Getter<U, T> {
aoqi@0	39	public U get(T t);
aoqi@0	40	}
aoqi@0	41
aoqi@0	42	static class Foo {
aoqi@0	43	private Integer a;
aoqi@0	44	private String b;
aoqi@0	45
aoqi@0	46	Foo(Integer a, String b) {
aoqi@0	47	this.a = a;
aoqi@0	48	this.b = b;
aoqi@0	49	}
aoqi@0	50
aoqi@0	51	static Integer getA(Foo f) { return f.a; }
aoqi@0	52	static String getB(Foo f) { return f.b; }
aoqi@0	53	}
aoqi@0	54
aoqi@0	55	public static <T, U extends Comparable<? super U>>
aoqi@0	56	void sortBy(List<T> s, final Getter<U, T> getter) {
aoqi@0	57	Collections.sort(s, new Comparator<T>() {
aoqi@0	58	public int compare(T t1, T t2) {
aoqi@0	59	return getter.get(t1).compareTo(getter.get(t2));
aoqi@0	60	}
aoqi@0	61	});
aoqi@0	62	};
aoqi@0	63
aoqi@0	64	public static void main(String[] args) {
aoqi@0	65	List<Foo> c = new ArrayList<Foo>();
aoqi@0	66	c.add(new Foo(2, "Hello3!"));
aoqi@0	67	c.add(new Foo(3, "Hello1!"));
aoqi@0	68	c.add(new Foo(1, "Hello2!"));
aoqi@0	69	checkSortByA(c);
aoqi@0	70	checkSortByB(c);
aoqi@0	71	}
aoqi@0	72
aoqi@0	73	static void checkSortByA(List<Foo> l) {
aoqi@0	74	sortBy(l, Foo::getA);
aoqi@0	75	int oldA = -1;
aoqi@0	76	for (Foo foo : l) {
aoqi@0	77	if (foo.a.compareTo(oldA) < 1) {
aoqi@0	78	throw new AssertionError();
aoqi@0	79	}
aoqi@0	80	}
aoqi@0	81	}
aoqi@0	82
aoqi@0	83	static void checkSortByB(List<Foo> l) {
aoqi@0	84	sortBy(l, Foo::getB);
aoqi@0	85	String oldB = "";
aoqi@0	86	for (Foo foo : l) {
aoqi@0	87	if (foo.b.compareTo(oldB) < 1) {
aoqi@0	88	throw new AssertionError();
aoqi@0	89	}
aoqi@0	90	}
aoqi@0	91	}
aoqi@0	92	}