diff -r 843d3b191773 -r 01c9d4161882 test/tools/javac/lambda/methodReference/MethodRef5.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/tools/javac/lambda/methodReference/MethodRef5.java Sat Nov 17 19:01:03 2012 +0000 @@ -0,0 +1,96 @@ +/* + * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +/** + * @test + * @bug 8003280 + * @summary Add lambda tests + * Test method reference with SAM interface Comparator + * @compile MethodRef5.java + * @run main MethodRef5 + */ + +import java.util.Collections; +import java.util.List; +import java.util.ArrayList; + +public class MethodRef5 { + + static class Person { + + private String firstName; + private String lastName; + private int age; + + public Person() { } + + public Person(String fn, String ln, int a) { + firstName = fn; + lastName = ln; + age = a; + } + + public String getLastName() { + return lastName; + } + + public int getAge() { + return age; + } + + //the following 2 methods are signature-compatible with Comparator.compare(): + public static int compareByAge(Person a, Person b) { + return a.age - b.age; + } + + public int compareByLastName(Person a, Person b) { + return a.lastName.compareToIgnoreCase(b.lastName); + } + } + + private static void assertTrue(boolean cond) { + if (!cond) + throw new AssertionError(); + } + + public static void main(String[] args) { + + List persons = new ArrayList(); + persons.add(new Person("John", "Smith", 49)); + persons.add(new Person("Abraham", "Lincoln", 30)); + persons.add(new Person("George", "Washington", 29)); + persons.add(new Person("Peter", "Derby", 50)); + Collections.sort(persons, Person::compareByAge);//static method reference to compareByAge(Person, Person) + String age = ""; + for (Person p : persons) { + age += p.getAge() + " "; + } + assertTrue( (age.equals("29 30 49 50 ")) ); + Collections.sort(persons, new Person()::compareByLastName);//instance method reference to compareByLastName(Person, Person) + String lastName = ""; + for (Person p : persons) { + lastName += p.getLastName() + " "; + } + assertTrue( lastName.equals("Derby Lincoln Smith Washington ") ); + } +}