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