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comparison: test/tools/javac/lambda/IdentifierTest.java

test/tools/javac/lambda/IdentifierTest.java

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1 /*
2 * @test /nodynamiccopyright/
3 * @bug 8007401 8007427
4 * @author sogoel
5 * @summary Test generation of warnings when '_' is used an identifier
6 * @compile/fail/ref=IdentifierTest.out -Werror -XDrawDiagnostics IdentifierTest.java
7 */
8
9 import java.util.List;
10
11 /*
12 * This test checks for the generation of warnings when '_' is used as an
13 * identifier in following cases:
14 * package name, class name, class member names including constructor
15 * cass members access using class object or this
16 * loops: for, enhanced-for, while, do-while
17 * arrays,
18 * switch,
19 * annotations, element=value pair
20 * try-catch,
21 * enum
22 * break + identifier
23 * continue + identifier
24 * type-bounds
25 * Above cases for identifier occurrences have been identified from JLS v3.
26 *
27 */
28
29 // Test class
30 public class IdentifierTest {
31 class _UnderscorePrefix {}
32 class Underscore_Infix {}
33 class UnderscorePostfix_ {}
34 class __ {}
35
36 static final int _prefix = 10;
37 List<String> postfix_;
38
39 // Test: class with name as '_'
40 class _ {
41 String in_fix;
42 //Test: Constructor, "_", local variable, value
43 public _() {
44 String _ = "_";
45 in_fix = _;
46 }
47
48 public void testClassMembersAccess(String[] _args) {
49 // Instance creation
50 _ _ = new _();
51 //Method invocation
52 _.testTryCatch();
53 //Field access
54 _.in_fix = "__";
55 }
56
57 // Test: try-catch
58 public void testTryCatch() {
59 try {
60 int _ = 30/0;
61 } catch (ArithmeticException _) {
62 System.out.println("Got Arithmentic exception " + _);
63 }
64 }
65 }
66
67 // Test: class member access using class object '_', use of this.
68 class TestMisc {
69 int _;
70 void _ () {
71 this._ = 5;
72 }
73
74 public void testClassMemberAccess(String[] args) {
75 // Instance creation
76 TestMisc _ = new TestMisc();
77 //Field access
78 _._ = 10;
79 //Method access
80 _._();
81 }
82 }
83
84 //Test: Type Bounds
85 class TestTypeBounds {
86 //Type bounds
87 <_ extends Object> void test(_ t) {}
88 }
89
90 // Test: enum and switch case
91 static class TestEnum {
92 // Enum
93 enum _ {
94 _MONDAY, _TUESDAY, _WEDNESDAY, _THURSDAY, _FRIDAY,
95 _SATURDAY, _SUNDAY;
96 }
97
98 void foo() {
99 // switch-case
100 for(_ _day : _.values()) {
101 switch(_day) {
102 case _SATURDAY:
103 case _SUNDAY:
104 System.out.println("Weekend is here!");
105 break;
106 default:
107 System.out.println("Weekday is here!");
108 break;
109 }
110 }
111 }
112 }
113
114 // Test: Annotation
115 static class TestAnno {
116 // Annotation with name as _
117 @interface _ {
118 String _name();
119 int _id();
120 }
121 // Element-Value pair
122 @_(_name ="m",_id=1)
123 public void m(int arg) {}
124
125 //Annotation with _ as one of the elements
126 @interface MyAnno {
127 int _();
128 }
129 // Element Value pair
130 @MyAnno(_='1')
131 public void m2() {}
132 }
133
134 // Test: for loop, while loop, do-while loop, increment/decrement op, condition, print
135 public void testLoop() {
136 // for loop
137 for(int _ = 0; _ < 5; ++_) {
138 System.out.println("_=" + _ + " ");
139 }
140
141 // while loop
142 int _ = 0;
143 while(_ <= 5) {
144 _++;
145 }
146
147 //do-while loop
148 do {
149 --_;
150 } while(_ > 0);
151 }
152
153 // Test: Array and enhanced for loop
154 public void testArraysEnhancedForLoop() {
155 // Arrays
156 String _[] = {"A","B","C","D"};
157
158 for(String _s : _ ) {
159 System.out.println("_s="+_s);
160 }
161 }
162
163 // Test: Labels in break, continue
164 public void testLabels() {
165 // break/continue with labels
166 int j = 0;
167 _:
168 for (int i = 0; i <= 5; i++) {
169 while( j > 4 ) {
170 j++;
171 continue _;
172 }
173 break _;
174 }
175 }
176 }
177
178 //interface
179 interface _ {
180 void mI();
181 }
182

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