Mercurial > jdk8-mips64-public > langtools / file comparison
comparison: test/tools/javac/lambda/MethodReference01.java
test/tools/javac/lambda/MethodReference01.java
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| 1 /* | |
| 2 * Copyright (c) 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 */ | |
| 23 | |
| 24 /* | |
| 25 * @test | |
| 26 * @bug 8003280 | |
| 27 * @summary Add lambda tests | |
| 28 * use method reference to sort list elements by field | |
| 29 * @author Brian Goetz | |
| 30 * @author Maurizio Cimadamore | |
| 31 * @run main MethodReference01 | |
| 32 */ | |
| 33 | |
| 34 import java.util.*; | |
| 35 | |
| 36 public class MethodReference01 { | |
| 37 | |
| 38 interface Getter<U, T> { | |
| 39 public U get(T t); | |
| 40 } | |
| 41 | |
| 42 static class Foo { | |
| 43 private Integer a; | |
| 44 private String b; | |
| 45 | |
| 46 Foo(Integer a, String b) { | |
| 47 this.a = a; | |
| 48 this.b = b; | |
| 49 } | |
| 50 | |
| 51 static Integer getA(Foo f) { return f.a; } | |
| 52 static String getB(Foo f) { return f.b; } | |
| 53 } | |
| 54 | |
| 55 public static <T, U extends Comparable<? super U>> | |
| 56 void sortBy(List<T> s, final Getter<U, T> getter) { | |
| 57 Collections.sort(s, new Comparator<T>() { | |
| 58 public int compare(T t1, T t2) { | |
| 59 return getter.get(t1).compareTo(getter.get(t2)); | |
| 60 } | |
| 61 }); | |
| 62 }; | |
| 63 | |
| 64 public static void main(String[] args) { | |
| 65 List<Foo> c = new ArrayList<Foo>(); | |
| 66 c.add(new Foo(2, "Hello3!")); | |
| 67 c.add(new Foo(3, "Hello1!")); | |
| 68 c.add(new Foo(1, "Hello2!")); | |
| 69 checkSortByA(c); | |
| 70 checkSortByB(c); | |
| 71 } | |
| 72 | |
| 73 static void checkSortByA(List<Foo> l) { | |
| 74 sortBy(l, Foo::getA); | |
| 75 int oldA = -1; | |
| 76 for (Foo foo : l) { | |
| 77 if (foo.a.compareTo(oldA) < 1) { | |
| 78 throw new AssertionError(); | |
| 79 } | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 static void checkSortByB(List<Foo> l) { | |
| 84 sortBy(l, Foo::getB); | |
| 85 String oldB = ""; | |
| 86 for (Foo foo : l) { | |
| 87 if (foo.b.compareTo(oldB) < 1) { | |
| 88 throw new AssertionError(); | |
| 89 } | |
| 90 } | |
| 91 } | |
| 92 } |
