1 /*
2  * Copyright (c) 2015, 2016, 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  * @test
26  * @bug 8131027
27  * @summary Test Type Inference
28  * @library /tools/lib
29  * @modules jdk.compiler/com.sun.tools.javac.api
30  *          jdk.compiler/com.sun.tools.javac.main
31  *          jdk.jdeps/com.sun.tools.javap
32  * @build KullaTesting TestingInputStream toolbox.ToolBox Compiler
33  * @run testng InferTypeTest
34  */
35 
36 import org.testng.annotations.Test;
37 
38 @Test
39 public class InferTypeTest extends KullaTesting {
40 
testTypeInference()41     public void testTypeInference() {
42         assertInferredType("1", "int");
43         assertEval("import java.util.*;");
44         assertInferredType("new ArrayList<String>()", "ArrayList<String>");
45         assertInferredType("null", "Object");
46         assertInferredType("1 + ", null); //incomplete
47         assertInferredType("undef", null);  //unresolvable
48         assertEval("List<String> l1;");
49         assertEval("List<? extends String> l2;");
50         assertEval("List<? super String> l3;");
51         assertInferredType("l1", "List<String>");
52         assertInferredType("l2", "List<? extends String>");
53         assertInferredType("l3", "List<? super String>");
54         assertInferredType("l1.get(0)", "String");
55         assertInferredType("l2.get(0)", "String");
56         assertInferredType("l3.get(0)", "Object");
57         assertInferredType("\"\" + 1", "String");
58         assertEval("int i = 0;");
59         assertInferredType("i++", "int");
60         assertInferredType("++i", "int");
61         assertInferredType("i == 0 ? l1.get(0) : l2.get(0)", "String");
62         assertInferredType("", null);
63         assertInferredType("void test() { }", null);
64         assertInferredType("class Test { }", null);
65         assertInferredType("enum Test { A; }", null);
66         assertInferredType("interface Test { }", null);
67         assertInferredType("@interface Test { }", null);
68         assertInferredType("Object o;", null);
69     }
70 
71 }
72