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 }