Mercurial > jdk8-mips64-public > langtools / file comparison
comparison: test/tools/javac/lambda/methodReference/MethodRef5.java
test/tools/javac/lambda/methodReference/MethodRef5.java
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| 1 /* | |
| 2 * Copyright (c) 2011, 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 * Test method reference with SAM interface Comparator<T> | |
| 29 * @compile MethodRef5.java | |
| 30 * @run main MethodRef5 | |
| 31 */ | |
| 32 | |
| 33 import java.util.Collections; | |
| 34 import java.util.List; | |
| 35 import java.util.ArrayList; | |
| 36 | |
| 37 public class MethodRef5 { | |
| 38 | |
| 39 static class Person { | |
| 40 | |
| 41 private String firstName; | |
| 42 private String lastName; | |
| 43 private int age; | |
| 44 | |
| 45 public Person() { } | |
| 46 | |
| 47 public Person(String fn, String ln, int a) { | |
| 48 firstName = fn; | |
| 49 lastName = ln; | |
| 50 age = a; | |
| 51 } | |
| 52 | |
| 53 public String getLastName() { | |
| 54 return lastName; | |
| 55 } | |
| 56 | |
| 57 public int getAge() { | |
| 58 return age; | |
| 59 } | |
| 60 | |
| 61 //the following 2 methods are signature-compatible with Comparator<Person>.compare(): | |
| 62 public static int compareByAge(Person a, Person b) { | |
| 63 return a.age - b.age; | |
| 64 } | |
| 65 | |
| 66 public int compareByLastName(Person a, Person b) { | |
| 67 return a.lastName.compareToIgnoreCase(b.lastName); | |
| 68 } | |
| 69 } | |
| 70 | |
| 71 private static void assertTrue(boolean cond) { | |
| 72 if (!cond) | |
| 73 throw new AssertionError(); | |
| 74 } | |
| 75 | |
| 76 public static void main(String[] args) { | |
| 77 | |
| 78 List<Person> persons = new ArrayList<Person>(); | |
| 79 persons.add(new Person("John", "Smith", 49)); | |
| 80 persons.add(new Person("Abraham", "Lincoln", 30)); | |
| 81 persons.add(new Person("George", "Washington", 29)); | |
| 82 persons.add(new Person("Peter", "Derby", 50)); | |
| 83 Collections.sort(persons, Person::compareByAge);//static method reference to compareByAge(Person, Person) | |
| 84 String age = ""; | |
| 85 for (Person p : persons) { | |
| 86 age += p.getAge() + " "; | |
| 87 } | |
| 88 assertTrue( (age.equals("29 30 49 50 ")) ); | |
| 89 Collections.sort(persons, new Person()::compareByLastName);//instance method reference to compareByLastName(Person, Person) | |
| 90 String lastName = ""; | |
| 91 for (Person p : persons) { | |
| 92 lastName += p.getLastName() + " "; | |
| 93 } | |
| 94 assertTrue( lastName.equals("Derby Lincoln Smith Washington ") ); | |
| 95 } | |
| 96 } |
