1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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).
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23 
24 import org.testng.annotations.Test;
25 
26 import java.util.function.IntFunction;
27 import java.util.function.Supplier;
28 
29 import static org.testng.Assert.assertTrue;
30 
31 /**
32  * ArrayCtorRefTest
33  *
34  * @author Brian Goetz
35  */
36 @Test
37 public class ArrayCtorRefTest {
38     interface ArrayMaker<T> {
make(int size)39         public T[] make(int size);
40     }
41 
emptyArrayFactory(ArrayMaker<T> maker)42     private static<T> Supplier<T[]> emptyArrayFactory(ArrayMaker<T> maker) {
43         return () -> maker.make(0);
44     }
45 
testLambda()46     public void testLambda() {
47         ArrayMaker<String> am = i -> new String[i];
48         String[] arr = am.make(3);
49         arr[0] = "Foo";
50         assertTrue(arr instanceof String[]);
51         assertTrue(arr.length == 3);
52     }
53 
testIntCtorRef()54     public void testIntCtorRef() {
55         IntFunction<int[]> factory = int[]::new;
56         int[] arr = factory.apply(6);
57         assertTrue(arr.length == 6);
58     }
59 
testLambdaInference()60     public void testLambdaInference() {
61         Supplier<Object[]> oF = emptyArrayFactory(i -> new Object[i]);
62         Supplier<String[]> sF = emptyArrayFactory(i -> new String[i]);
63         assertTrue(oF.get() instanceof Object[]);
64         assertTrue(sF.get() instanceof String[]);
65     }
66 
testCtorRef()67     public void testCtorRef() {
68         ArrayMaker<String> am = String[]::new;
69         String[] arr = am.make(3);
70         arr[0] = "Foo";
71         assertTrue(arr instanceof String[]);
72         assertTrue(arr.length == 3);
73     }
74 }
75