aoqi@0: /*
aoqi@0:  * @test   /nodynamiccopyright/
aoqi@0:  * @bug    8007401 8007427
aoqi@0:  * @author sogoel
aoqi@0:  * @summary Test generation of warnings when '_' is used an identifier
aoqi@0:  * @compile/fail/ref=IdentifierTest.out -Werror -XDrawDiagnostics IdentifierTest.java
aoqi@0:  */
aoqi@0: 
aoqi@0: import java.util.List;
aoqi@0: 
aoqi@0: /*
aoqi@0:  * This test checks for the generation of warnings when '_' is used as an
aoqi@0:  * identifier in following cases:
aoqi@0:  * package name, class name, class member names including constructor
aoqi@0:  * cass members access using class object or this
aoqi@0:  * loops: for, enhanced-for, while, do-while
aoqi@0:  * arrays,
aoqi@0:  * switch,
aoqi@0:  * annotations, element=value pair
aoqi@0:  * try-catch,
aoqi@0:  * enum
aoqi@0:  * break + identifier
aoqi@0:  * continue + identifier
aoqi@0:  * type-bounds
aoqi@0:  * Above cases for identifier occurrences have been identified from JLS v3.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: // Test class
aoqi@0: public class IdentifierTest {
aoqi@0:     class _UnderscorePrefix {}
aoqi@0:     class Underscore_Infix {}
aoqi@0:     class UnderscorePostfix_ {}
aoqi@0:     class __ {}
aoqi@0: 
aoqi@0:     static final int _prefix = 10;
aoqi@0:     List<String> postfix_;
aoqi@0: 
aoqi@0:     // Test: class with name as '_'
aoqi@0:     class _ {
aoqi@0:         String in_fix;
aoqi@0:         //Test: Constructor, "_", local variable, value
aoqi@0:         public _() {
aoqi@0:             String _ = "_";
aoqi@0:             in_fix = _;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public void testClassMembersAccess(String[] _args) {
aoqi@0:             // Instance creation
aoqi@0:             _ _ = new _();
aoqi@0:             //Method invocation
aoqi@0:             _.testTryCatch();
aoqi@0:             //Field access
aoqi@0:             _.in_fix = "__";
aoqi@0:         }
aoqi@0: 
aoqi@0:         // Test: try-catch
aoqi@0:         public void testTryCatch() {
aoqi@0:             try {
aoqi@0:                 int _ = 30/0;
aoqi@0:             } catch (ArithmeticException _) {
aoqi@0:                 System.out.println("Got Arithmentic exception " + _);
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     // Test: class member access using class object '_', use of this.
aoqi@0:     class TestMisc {
aoqi@0:         int _;
aoqi@0:         void _ () {
aoqi@0:             this._ = 5;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public void testClassMemberAccess(String[] args) {
aoqi@0:             // Instance creation
aoqi@0:             TestMisc _ = new TestMisc();
aoqi@0:             //Field access
aoqi@0:             _._ = 10;
aoqi@0:            //Method access
aoqi@0:             _._();
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     //Test: Type Bounds
aoqi@0:     class TestTypeBounds {
aoqi@0:         //Type bounds
aoqi@0:         <_ extends Object> void test(_ t) {}
aoqi@0:     }
aoqi@0: 
aoqi@0:     // Test: enum and switch case
aoqi@0:     static class TestEnum {
aoqi@0:         // Enum
aoqi@0:         enum _ {
aoqi@0:             _MONDAY, _TUESDAY, _WEDNESDAY, _THURSDAY, _FRIDAY,
aoqi@0:             _SATURDAY, _SUNDAY;
aoqi@0:         }
aoqi@0: 
aoqi@0:         void foo() {
aoqi@0:             // switch-case
aoqi@0:             for(_ _day : _.values()) {
aoqi@0:                 switch(_day) {
aoqi@0:                 case _SATURDAY:
aoqi@0:                 case _SUNDAY:
aoqi@0:                     System.out.println("Weekend is here!");
aoqi@0:                     break;
aoqi@0:                 default:
aoqi@0:                     System.out.println("Weekday is here!");
aoqi@0:                     break;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     // Test: Annotation
aoqi@0:     static class TestAnno {
aoqi@0:         // Annotation with name as _
aoqi@0:         @interface _ {
aoqi@0:             String _name();
aoqi@0:             int _id();
aoqi@0:         }
aoqi@0:         // Element-Value pair
aoqi@0:         @_(_name ="m",_id=1)
aoqi@0:         public void m(int arg) {}
aoqi@0: 
aoqi@0:         //Annotation with _ as one of the elements
aoqi@0:         @interface MyAnno {
aoqi@0:             int _();
aoqi@0:         }
aoqi@0:         // Element Value pair
aoqi@0:         @MyAnno(_='1')
aoqi@0:         public void m2() {}
aoqi@0:     }
aoqi@0: 
aoqi@0:     // Test: for loop, while loop, do-while loop, increment/decrement op, condition, print
aoqi@0:     public void testLoop() {
aoqi@0:         // for loop
aoqi@0:         for(int _ = 0; _ < 5; ++_) {
aoqi@0:             System.out.println("_=" + _ + " ");
aoqi@0:         }
aoqi@0: 
aoqi@0:         // while loop
aoqi@0:         int _ = 0;
aoqi@0:         while(_ <= 5) {
aoqi@0:             _++;
aoqi@0:         }
aoqi@0: 
aoqi@0:         //do-while loop
aoqi@0:         do {
aoqi@0:             --_;
aoqi@0:         } while(_ > 0);
aoqi@0:     }
aoqi@0: 
aoqi@0:     // Test: Array and enhanced for loop
aoqi@0:     public void testArraysEnhancedForLoop() {
aoqi@0:         // Arrays
aoqi@0:         String _[] = {"A","B","C","D"};
aoqi@0: 
aoqi@0:         for(String _s : _ ) {
aoqi@0:             System.out.println("_s="+_s);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     // Test: Labels in break, continue
aoqi@0:     public void testLabels() {
aoqi@0:         // break/continue with labels
aoqi@0:         int j = 0;
aoqi@0:     _:
aoqi@0:         for (int i = 0; i <= 5; i++) {
aoqi@0:             while( j > 4 ) {
aoqi@0:                 j++;
aoqi@0:                 continue _;
aoqi@0:             }
aoqi@0:             break _;
aoqi@0:         }
aoqi@0:     }
aoqi@0: }
aoqi@0: 
aoqi@0: //interface
aoqi@0: interface _ {
aoqi@0:     void mI();
aoqi@0: }
aoqi@0: