1 /*
   2  * Copyright (c) 2012 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package org.openjdk.tests.javac;
  27 
  28 import java.util.Arrays;
  29 import java.util.function.Function;
  30 import java.util.stream.Collectors;
  31 import java.util.stream.Stream;
  32 
  33 import org.testng.annotations.Test;
  34 
  35 import static org.testng.Assert.assertEquals;
  36 
  37 @Test(groups = "lib")
  38 public class MethodReferenceTestInstanceMethod {
  39     public Stream<String> generate() {
  40         return Arrays.asList("one", "two", "three", "four", "five", "six")
  41             .stream()
  42             .filter(s->s.length() > 3)
  43             .map(s -> s.toUpperCase());
  44     }
  45 
  46     class Thingy<T,U> {
  47         U blah(Function<T, U> m, T val) {
  48             return m.apply(val);
  49         }
  50     }
  51 
  52     public void testStringBuffer() {
  53         String s = generate().collect(Collectors.toStringBuilder()).toString();
  54         assertEquals(s, "THREEFOURFIVE");
  55     }
  56 
  57     public void testMRInstance() {
  58         Thingy<String,String> t = new Thingy<>();
  59         assertEquals(t.blah(String::toUpperCase, "frogs"), "FROGS");
  60     }
  61 
  62 }