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.
   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 import java.util.Arrays;
  26 import java.util.function.Function;
  27 import java.util.stream.Collectors;
  28 import java.util.stream.Stream;
  29 
  30 import org.testng.annotations.Test;
  31 
  32 import static org.testng.Assert.assertEquals;
  33 
  34 @Test(groups = "lib")
  35 public class MethodReferenceTestInstanceMethod {
  36     public Stream<String> generate() {
  37         return Arrays.asList("one", "two", "three", "four", "five", "six")
  38             .stream()
  39             .filter(s->s.length() > 3)
  40             .map(s -> s.toUpperCase());
  41     }
  42 
  43     class Thingy<T,U> {
  44         U blah(Function<T, U> m, T val) {
  45             return m.apply(val);
  46         }
  47     }
  48 
  49     public void testStringBuffer() {
  50         String s = generate().collect(Collectors.toStringBuilder()).toString();
  51         assertEquals(s, "THREEFOURFIVE");
  52     }
  53 
  54     public void testMRInstance() {
  55         Thingy<String,String> t = new Thingy<>();
  56         assertEquals(t.blah(String::toUpperCase, "frogs"), "FROGS");
  57     }
  58 
  59 }