Mercurial > jdk8-mips64-public > langtools / file comparison

comparison: test/tools/javac/lambda/lambdaExpression/LambdaTest1.java

test/tools/javac/lambda/lambdaExpression/LambdaTest1.java

changeset 1415
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child 2370
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1414:843d3b191773 1415:01c9d4161882
1 /*
2 * Copyright (c) 2011, 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 8003280
27 * @summary Add lambda tests
28 * Test lambda expressions for existing SAM interfaces like Runnable and Comparator<T>
29 * @compile LambdaTest1.java
30 * @run main LambdaTest1
31 */
32
33 import java.util.Collections;
34 import java.util.List;
35 import java.util.ArrayList;
36 import java.util.Date;
37
38 public class LambdaTest1 {
39
40 private static String assertionStr = "";
41
42 private static void assertTrue(boolean b) {
43 if(!b)
44 throw new AssertionError();
45 }
46
47 private static void test1(Runnable r) {
48 r.run();
49 }
50
51 void test2(Object o) {
52 if(o instanceof Runnable)
53 ((Runnable)o).run();
54 }
55
56 Runnable test3() {
57 return ()-> { assertionStr += "Runnable6"; };
58 }
59
60 public static void main(String[] args) {
61
62 //lambda expressions for SAM interface Runnable:
63 //assign:
64 Runnable r = ()-> { assertionStr += "Runnable1 "; };
65 r.run();
66
67 //cast:
68 ((Runnable)()-> { assertionStr += "Runnable2 "; }).run();
69
70 Object o = (Runnable)()-> {};
71
72 o = (Runnable)()-> {
73 switch (assertionStr) {
74 case "Runnable1 Runnable2 ":
75 assertionStr += "Runnable3 ";
76 break;
77 default:
78 throw new AssertionError();
79 }
80 return;
81 };
82
83 //method parameter:
84 test1(()-> { assertionStr += "Runnable4 "; return; });
85
86 LambdaTest1 test = new LambdaTest1();
87 test.test2((Runnable)()-> { assertionStr += "Runnable5 "; });
88
89 //return type:
90 r = test.test3();
91 r.run();
92
93 assertTrue(assertionStr.equals("Runnable1 Runnable2 Runnable4 Runnable5 Runnable6"));
94
95 //lambda expressions for SAM interface Comparator<T>:
96 List<Integer> list = new ArrayList<Integer>();
97 list.add(4);
98 list.add(10);
99 list.add(-5);
100 list.add(100);
101 list.add(9);
102 Collections.sort(list, (Integer i1, Integer i2)-> i2 - i1);
103 String result = "";
104 for(int i : list)
105 result += i + " ";
106 assertTrue(result.equals("100 10 9 4 -5 "));
107
108 Collections.sort(list,
109 (i1, i2) -> {
110 String s1 = i1.toString();
111 String s2 = i2.toString();
112 return s1.length() - s2.length();
113 });
114 result = "";
115 for(int i : list)
116 result += i + " ";
117 assertTrue(result.equals("9 4 10 -5 100 "));
118 }
119 }

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