Thu, 10 Oct 2013 14:58:04 +0200
8001931: The new build system whitespace cleanup
Reviewed-by: tbell, simonis, erikj
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 | } |