The Java Language Specification, Third Edition

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5.6 Numeric Promotions CONVERSIONS AND PROMOTIONS 108 } } int[] shortvec = new int[2]; Object o = shortvec; // The following line will throw a ClassCastException: Colorable c = (Colorable)o; c.setColor(0); 5.6 Numeric Promotions Numeric promotion is applied to the operands of an arithmetic operator. Numeric promotion contexts allow the use of an identity conversion (§5.1.1) a widening primitive conversion (§5.1.2), or an unboxing conversion (§5.1.8). Numeric promotions are used to convert the operands of a numeric operator to a common type so that an operation can be performed. The two kinds of numeric promotion are unary numeric promotion (§5.6.1) and binary numeric promotion (§5.6.2). 5.6.1 Unary Numeric Promotion Some operators apply unary numeric promotion to a single operand, which must produce a value of a numeric type: • If the operand is of compile-time type Byte, Short, Character, orInteger it is subjected to unboxing conversion. The result is then promoted to a value of type int by a widening conversion (§5.1.2) or an identity conversion. • Otherwise, if the operand is of compile-time type Long, Float, orDouble it is subjected to unboxing conversion. • Otherwise, if the operand is of compile-time type byte, short, or char, unary numeric promotion promotes it to a value of type int by a widening conversion (§5.1.2). • Otherwise, a unary numeric operand remains as is and is not converted. In any case, value set conversion (§5.1.13) is then applied. DRAFT
CONVERSIONS AND PROMOTIONS Unary Numeric Promotion 5.6.1 Unary numeric promotion is performed on expressions in the following situations: • Each dimension expression in an array creation expression (§15.10) • The index expression in an array access expression (§15.13) • The operand of a unary plus operator + (§15.15.3) • The operand of a unary minus operator - (§15.15.4) • The operand of a bitwise complement operator ~ (§15.15.5) • Each operand, separately, of a shift operator >>, >>>,or
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The Java Language Specification Th
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The Java Language Specification Th
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Copyright © 1996-2005 Sun Microsys
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“When I use a word,” Humpty Dum
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Preface XXIII Preface to the Second
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5.4 String Conversion 101 5.5 Casti
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8.2.1.3 Inheritance with private 19
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10 Arrays 287 10.1 Array Types 288
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14 Blocks and Statements 359 14.1 N
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15.12.4.4 Locate Method to Invoke 4
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17.4.2 Actions 558 17.4.3 Programs
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Preface THE Java programming langua
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PREFACE was invaluable to us during
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Preface to the Second Edition ... t
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PREFACE TO THE SECOND EDITION Trici
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Preface to the Third Edition This e
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PREFACE TO THE THIRD EDITION Joe Da
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1.0 CHAPTER1 Introduction If I have
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INTRODUCTION Introduction 1 declare
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INTRODUCTION Example Programs 1.1 B
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INTRODUCTION References 1.4 Goldber
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CHAPTER2 Grammars Grammar, which kn
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GRAMMARS Grammar Notation 2.4 actua
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CHAPTER3 Lexical Structure Lexicogr
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LEXICAL STRUCTURE Unicode Escapes 3
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LEXICAL STRUCTURE Input Elements an
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LEXICAL STRUCTURE Identifiers 3.8 E
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LEXICAL STRUCTURE Literals 3.10 3.9
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LEXICAL STRUCTURE Integer Literals
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LEXICAL STRUCTURE Floating-Point Li
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LEXICAL STRUCTURE Character Literal
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LEXICAL STRUCTURE String Literals 3
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LEXICAL STRUCTURE Operators 3.12 3.
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CHAPTER4 Types, Values, and Variabl
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TYPES, VALUES, AND VARIABLES Integr
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TYPES, VALUES, AND VARIABLES Floati
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TYPES, VALUES, AND VARIABLES The bo
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TYPES, VALUES, AND VARIABLES Object
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TYPES, VALUES, AND VARIABLES The Cl
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TYPES, VALUES, AND VARIABLES Type V
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TYPES, VALUES, AND VARIABLES Parame
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TYPES, VALUES, AND VARIABLES Type A
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TYPES, VALUES, AND VARIABLES Member
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Page 103 and 104: TYPES, VALUES, AND VARIABLES Kinds
Page 105 and 106: TYPES, VALUES, AND VARIABLES Initia
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Page 111 and 112: CHAPTER5 Conversions and Promotions
Page 113 and 114: CONVERSIONS AND PROMOTIONS Conversi
Page 115 and 116: CONVERSIONS AND PROMOTIONS Widening
Page 117 and 118: CONVERSIONS AND PROMOTIONS Narrowin
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Page 121 and 122: CONVERSIONS AND PROMOTIONS Boxing C
Page 123 and 124: CONVERSIONS AND PROMOTIONS Capture
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Page 127 and 128: CONVERSIONS AND PROMOTIONS Assignme
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Page 135 and 136: CONVERSIONS AND PROMOTIONS Casting
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Page 147 and 148: CHAPTER6 Names The Tao that can be
Page 149 and 150: NAMES Names and Identifiers 6.2 ❖
Page 151 and 152: NAMES Scope of a Declaration 6.3 in
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Page 157 and 158: NAMES The Members of a Class Type 6
Page 159 and 160: NAMES The Members of an Array Type
Page 161 and 162: NAMES Syntactic Classification of a
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Page 169 and 170: NAMES Meaning of Expression Names 6
Page 171 and 172: NAMES Meaning of Method Names 6.5.7
Page 173 and 174: NAMES Details on protected Access 6
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Page 179 and 180: NAMES Fully Qualified Names and Can
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Page 183 and 184: NAMES Method Names 6.8.4 DISCUSSION
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Page 187 and 188: CHAPTER7 Packages Good things come
Page 189 and 190: PACKAGES Storing Packages in a File
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PACKAGES Unnamed Packages 7.4.2 on
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PACKAGES Single-Type-Import Declara
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PACKAGES Type-Import-on-Demand Decl
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PACKAGES A Strange Example 7.5.6 7.
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PACKAGES Top Level Type Declaration
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PACKAGES Unique Package Names 7.7 t
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PACKAGES Unique Package Names 7.7 o
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CHAPTER8 Classes Origins: A Short E
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CLASSES Class Modifiers 8.1.1 8.1 C
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CLASSES Class Modifiers 8.1.1 class
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CLASSES Generic Classes and Type Pa
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CLASSES Inner Classes and Enclosing
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CLASSES Inner Classes and Enclosing
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CLASSES Superclasses and Subclasses
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CLASSES Superinterfaces 8.1.5 resul
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CLASSES Class Body and Member Decla
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CLASSES Class Members 8.2 Construct
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CLASSES Examples of Inheritance 8.2
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CLASSES Examples of Inheritance 8.2
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CLASSES Field Modifiers 8.3.1 If a
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CLASSES Field Modifiers 8.3.1 of ac
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CLASSES Initialization of Fields 8.
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CLASSES Initialization of Fields 8.
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CLASSES Examples of Field Declarati
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CLASSES Examples of Field Declarati
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CLASSES Method Declarations 8.4 fie
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CLASSES Formal Parameters 8.4.1 of
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CLASSES Method Signature 8.4.2 Two
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CLASSES Method Modifiers 8.4.3 an i
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CLASSES Method Modifiers 8.4.3 resp
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CLASSES Method Modifiers 8.4.3 Thes
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CLASSES Method Throws 8.4.6 • If
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CLASSES Method Body 8.4.7 Object do
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CLASSES Inheritance, Overriding, an
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CLASSES Inheritance, Overriding, an
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CLASSES Overloading 8.4.9 DISCUSSIO
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CLASSES Examples of Method Declarat
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CLASSES Member Type Declarations 8.
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CLASSES Static Initializers 8.7 aga
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CLASSES Constructor Modifiers 8.8.3
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CLASSES Constructor Body 8.8.7 clas
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CLASSES Constructor Body 8.8.7 •
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CLASSES Default Constructor 8.8.9 8
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CLASSES Enums 8.9 8.9 Enums An enum
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CLASSES Enums 8.9 DISCUSSION This i
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CLASSES Enums 8.9 Note that the exa
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CLASSES Enums 8.9 DIME: 10¢ SILVER
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CLASSES Enums 8.9 public static voi
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CHAPTER9 Interfaces My apple trees
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INTERFACES Superinterfaces and Subi
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INTERFACES Interface Members 9.2 9.
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INTERFACES Examples of Field Declar
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INTERFACES Inheritance and Overridi
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INTERFACES Examples of Abstract Met
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INTERFACES Annotation Types 9.6 DIS
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INTERFACES Predefined Annotation Ty
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INTERFACES Predefined Annotation Ty
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INTERFACES Annotations 9.7 • The
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INTERFACES Annotations 9.7 TypeName
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INTERFACES Annotations 9.7 The seco
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CHAPTER10 Arrays Even Solomon in al
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ARRAYS Array Access 10.4 Here are s
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ARRAYS Array Initializers 10.6 Arra
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ARRAYS Class Objects for Arrays 10.
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ARRAYS Array Store Exception 10.10
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CHAPTER11 Exceptions If anything ca
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EXCEPTIONS Exception Analysis of Ex
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EXCEPTIONS Why Runtime Exceptions a
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EXCEPTIONS Handling Asynchronous Ex
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EXCEPTIONS An Example of Exceptions
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EXCEPTIONS Virtual Machine Errors 1
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CHAPTER12 Execution We must all han
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EXECUTION Initialize Test: Execute
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EXECUTION The Loading Process 12.2.
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EXECUTION Resolution of Symbolic Re
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EXECUTION When Initialization Occur
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EXECUTION Detailed Initialization P
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EXECUTION Initialization: Implicati
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EXECUTION Creation of New Class Ins
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EXECUTION Finalization of Class Ins
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EXECUTION Implementing Finalization
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EXECUTION Finalizer Invocations are
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EXECUTION Program Exit 12.8 ers. A
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CHAPTER13 Binary Compatibility Desp
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BINARY COMPATIBILITY The Form of a
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BINARY COMPATIBILITY The Form of a
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BINARY COMPATIBILITY What Binary Co
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BINARY COMPATIBILITY Superclasses a
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BINARY COMPATIBILITY Class Body and
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BINARY COMPATIBILITY Field Declarat
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BINARY COMPATIBILITY final Fields a
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BINARY COMPATIBILITY static Fields
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BINARY COMPATIBILITY Method and Con
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BINARY COMPATIBILITY final Methods
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BINARY COMPATIBILITY Method and Con
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BINARY COMPATIBILITY Interface Form
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CHAPTER14 Blocks and Statements He
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BLOCKS AND STATEMENTS Local Class D
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BLOCKS AND STATEMENTS Local Variabl
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BLOCKS AND STATEMENTS Scope of Loca
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BLOCKS AND STATEMENTS Execution of
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BLOCKS AND STATEMENTS Statements 14
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BLOCKS AND STATEMENTS Expression St
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BLOCKS AND STATEMENTS The assert St
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BLOCKS AND STATEMENTS The assert St
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BLOCKS AND STATEMENTS The switch St
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BLOCKS AND STATEMENTS The switch St
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BLOCKS AND STATEMENTS Abrupt Comple
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BLOCKS AND STATEMENTS Example of do
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BLOCKS AND STATEMENTS The basic for
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BLOCKS AND STATEMENTS The enhanced
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BLOCKS AND STATEMENTS The break Sta
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BLOCKS AND STATEMENTS The continue
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BLOCKS AND STATEMENTS The throw Sta
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BLOCKS AND STATEMENTS The synchroni
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BLOCKS AND STATEMENTS The try state
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BLOCKS AND STATEMENTS Unreachable S
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CHAPTER15 Expressions When you can
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EXPRESSIONS Expressions and Run-Tim
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EXPRESSIONS Normal and Abrupt Compl
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EXPRESSIONS Evaluate Left-Hand Oper
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EXPRESSIONS Evaluation Respects Par
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EXPRESSIONS Evaluation Order for Ot
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EXPRESSIONS this 15.8.3 ing-point l
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EXPRESSIONS Class Instance Creation
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EXPRESSIONS Determining Enclosing I
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EXPRESSIONS Choosing the Constructo
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EXPRESSIONS Anonymous Class Declara
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EXPRESSIONS Array Creation Expressi
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EXPRESSIONS Example: Array Creation
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EXPRESSIONS Field Access Using a Pr
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EXPRESSIONS Field Access Using a Pr
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EXPRESSIONS Accessing Superclass Me
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EXPRESSIONS Compile-Time Step 1: De
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EXPRESSIONS Compile-Time Step 3: Is
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EXPRESSIONS Runtime Evaluation of M
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EXPRESSIONS Examples: Array Access
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EXPRESSIONS Postfix Increment Opera
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EXPRESSIONS Prefix Increment Operat
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EXPRESSIONS Unary Minus Operator -
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EXPRESSIONS Multiplicative Operator
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EXPRESSIONS Division Operator / 15.
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EXPRESSIONS Remainder Operator % 15
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EXPRESSIONS String Concatenation Op
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EXPRESSIONS String Concatenation Op
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EXPRESSIONS Additive Operators (+ a
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EXPRESSIONS Numerical Comparison Op
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EXPRESSIONS Equality Operators 15.2
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EXPRESSIONS Reference Equality Oper
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EXPRESSIONS Conditional-Or Operator
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EXPRESSIONS Conditional Operator ?
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EXPRESSIONS Simple Assignment Opera
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EXPRESSIONS Compound Assignment Ope
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EXPRESSIONS Constant Expression 15.
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CHAPTER16 Definite Assignment All t
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DEFINITE ASSIGNMENT Definite Assign
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DEFINITE ASSIGNMENT The Boolean Ope
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DEFINITE ASSIGNMENT Assignment Expr
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DEFINITE ASSIGNMENT Other Expressio
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DEFINITE ASSIGNMENT Local Variable
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DEFINITE ASSIGNMENT switch Statemen
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DEFINITE ASSIGNMENT for Statements
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DEFINITE ASSIGNMENT try Statements
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CHAPTER17 Threads and Locks And oft
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THREADS AND LOCKS Incorrectly Synch
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THREADS AND LOCKS Memory Model 17.4
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THREADS AND LOCKS Actions 17.4.2
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THREADS AND LOCKS Happens-before Or
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THREADS AND LOCKS Executions 17.4.6
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THREADS AND LOCKS Executions and Ca
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THREADS AND LOCKS Observable Behavi
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THREADS AND LOCKS Final Field Seman
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THREADS AND LOCKS Semantics of Fina
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THREADS AND LOCKS Subsequent Modifi
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THREADS AND LOCKS Non-atomic Treatm
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THREADS AND LOCKS Notification 17.8
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THREADS AND LOCKS Sleep and Yield 1
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CHAPTER18 Syntax Is there grammar i
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SYNTAX The Grammar of the Java Prog
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A abrupt completion See completion,
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definite assignment before, 548 det
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See also numbers literals, term def
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See local class member See member c
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See also hiding; obscuring; scope;
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in assignment conversion context, 9
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of blank final class variables, 199
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interface, multiply inherited, 266
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division, evaluation, 493 equality
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easons why constructors cannot be,
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identity conversion in assignment c
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order, 428 expressions as statement
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L labeled statements identifiers in
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term definition, 122 type, 44 memor
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class, 175 constructor, 241 declara
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conversions of and to See conversio
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importing all public types from a,
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Q superclasses, accessing instances
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internal symbolic reference table,
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declaring class methods with, 216 h
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applicable by subtyping, 445 applic
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unchecked, 301 executed, 409 exit o
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precision, loss of, 81 preparation,
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termination and virtual machine exi
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members and constructors, 55 reifia
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of binary representation, of classe
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Colophon CAMERA-READY electronic co
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