The Java Virtual Machine Specification.《Java 虚拟机规范》中文翻译及示例
Introduction
1 引言
1.1 章节组织
1.2 程序示例
1.3 符号
1.4 与预定义类和接口的关系
1.5 反馈
1.6 参考引用
2 Grammars
2.1 Context-Free Grammars
2.2 The Lexical Grammar
2.3 The Syntactic Grammar
2.4 Grammar Notation
3 Lexical Structure
3.1 Unicode
3.2 Lexical Translations
3.3 Unicode Escapes
3.4 Line Terminators
3.5 Input Elements and Tokens
3.6 White Space
3.7 Comments
3.8 Identifiers
3.9 Keywords
3.10 Literals
3.10.1 Integer Literals
3.10.2 Floating-Point Literals
3.10.3 Boolean Literals
3.10.4 Character Literals
3.10.5 String Literals
3.10.6 Escape Sequences for Character and String Literals
3.10.7 The Null Literal
3.11 Separators
3.12 Operators
4 Types, Values, and Variables
4.1 The Kinds of Types and Values
4.2 Primitive Types and Values
4.2.1 Integral Types and Values
4.2.2 Integer Operations
4.2.3 Floating-Point Types, Formats, and Values
4.2.4 Floating-Point Operations
4.2.5 The boolean Type and boolean Values
4.3 Reference Types and Values
4.3.1 Objects
4.3.2 The Class Object
4.3.3 The Class String
4.3.4 When Reference Types Are the Same
4.4 Type Variables
4.5 Parameterized Types
4.5.1 Type Arguments of Parameterized Types
4.5.2 Members and Constructors of Parameterized Types
4.6 Type Erasure
4.7 Reifiable Types
4.8 Raw Types
4.9 Intersection Types
4.10 Subtyping
4.10.1 Subtyping among Primitive Types
4.10.2 Subtyping among Class and Interface Types
4.10.3 Subtyping among Array Types
4.10.4 Least Upper Bound
4.10.5 Type Projections
4.11 Where Types Are Used
4.12 Variables
4.12.1 Variables of Primitive Type
4.12.2 Variables of Reference Type
4.12.3 Kinds of Variables
4.12.4 final Variables
4.12.5 Initial Values of Variables
4.12.6 Types, Classes, and Interfaces
5 Conversions and Contexts
5.1 Kinds of Conversion
[5.1.1 Identity Conversion 98
[5.1.2 Widening Primitive Conversion 98
[5.1.3 Narrowing Primitive Conversion 100
[5.1.4 Widening and Narrowing Primitive Conversion 103
[5.1.5 Widening Reference Conversion 103
[5.1.6 Narrowing Reference Conversion 103
[5.1.6.1 Allowed Narrowing Reference Conversion 104
[5.1.6.2 Checked and Unchecked Narrowing Reference
[5.1.6.3 Narrowing Reference Conversions at Run Time 105
[5.1.7 Boxing Conversion 107
[5.1.8 Unboxing Conversion 109
[5.1.9 Unchecked Conversion 110
[5.1.10 Capture Conversion 111
[5.1.11 String Conversion 113
[5.1.12 Forbidden Conversions 114
[5.1.13 Value Set Conversion 114
5.2 Assignment Contexts
5.3 Invocation Contexts
5.4 String Contexts
5.5 Casting Contexts
5.6 Numeric Contexts
[5.6.1 Unary Numeric Promotion 129
[5.6.2 Binary Numeric Promotion 130
6 Names
6.1 Declarations
6.2 Names and Identifiers
6.3 Scope of a Declaration
6.4 Shadowing and Obscuring
[6.4.1 Shadowing 149
[6.4.2 Obscuring 152
6.5 Determining the Meaning of a Name
[6.5.1 Syntactic Classification of a Name According to Context 154
[6.5.2 Reclassification of Contextually Ambiguous Names 157
[6.5.3 Meaning of Module Names and Package Names 160
[6.5.6 Meaning of Expression Names 162
6.6 Access Control
[6.6.1 Determining Accessibility 168
[6.6.2 Details on protected Access 172
6.7 Fully Qualified Names and Canonical Names
7 Packages and Modules
7.1 Package Members
7.2 Host Support for Modules and Packages
7.3 Compilation Units
7.4 Package Declarations
[7.4.1 Named Packages 184
[7.4.2 Unnamed Packages 184
[7.4.3 Package Observability and Visibility 185
[7.5 Import Declarations 186
[7.5.1 Single-Type-Import Declarations 187
[7.5.2 Type-Import-on-Demand Declarations 189
[7.5.3 Single-Static-Import Declarations 190
[7.5.4 Static-Import-on-Demand Declarations 191
[7.6 Top Level Type Declarations 192
7.7 Module Declarations
[7.7.1 Dependences 197
[7.7.2 Exported and Opened Packages 200
[7.7.3 Service Consumption 201
[7.7.4 Service Provision 201
[7.7.5 Unnamed Modules 202
[7.7.6 Observability of a Module 203
8 Classes
8.1 Class Declarations
[8.1.1 Class Modifiers 207
[8.1.2 Generic Classes and Type Parameters 210
[8.1.3 Inner Classes and Enclosing Instances 213
[8.1.4 Superclasses and Subclasses 216
[8.1.5 Superinterfaces 218
[8.1.6 Class Body and Member Declarations 222
8.2 Class Members
8.3 Field Declarations
[8.3.1 Field Modifiers 232
[8.3.2 Field Initialization 237
[8.3.3 Restrictions on Field References in Initializers 239
8.4 Method Declarations
[8.4.1 Formal Parameters 243
[8.4.2 Method Signature 247
[8.4.3 Method Modifiers 248
[8.4.4 Generic Methods 253
[8.4.5 Method Result 254
[8.4.6 Method Throws 255
[8.4.7 Method Body 256
[8.4.8 Inheritance, Overriding, and Hiding 257
[8.4.9 Overloading 268
8.5 Member Type Declarations
[8.5.1 Static Member Type Declarations
8.6 Instance Initializers
8.7 Static Initializers
8.8 Constructor Declarations
[8.8.1 Formal Parameters 274
[8.8.2 Constructor Signature 275
[8.8.3 Constructor Modifiers 275
[8.8.4 Generic Constructors 276
[8.8.5 Constructor Throws 276
[8.8.6 The Type of a Constructor 277
[8.8.7 Constructor Body 277
[8.8.7.1 Explicit Constructor Invocations 278
[8.8.8 Constructor Overloading 282
[8.8.9 Default Constructor 282
[8.8.10 Preventing Instantiation of a Class 284
8.9 Enum Types
[8.9.1 Enum Constants 285
[8.9.2 Enum Body Declarations 286
[8.9.3 Enum Members 288
9 Interfaces
9.1 Interface Declarations
[9.1.1 Interface Modifiers 296
[9.1.2 Generic Interfaces and Type Parameters 297
[9.1.3 Superinterfaces and Subinterfaces 298
[9.1.4 Interface Body and Member Declarations 300
9.2 Interface Members
9.3 Field (Constant) Declarations
[9.3.1 Initialization of Fields in Interfaces 303
9.4 Method Declarations
[9.4.1 Inheritance and Overriding 305
[9.4.2 Overloading 309
[9.4.3 Interface Method Body 309
9.5 Member Type Declarations
9.6 Annotation Types
[9.6.1 Annotation Type Elements 312
[9.6.2 Defaults for Annotation Type Elements 315
[9.6.3 Repeatable Annotation Types 316
[9.6.4 Predefined Annotation Types 320
9.7 Annotations
[9.7.1 Normal Annotations 329
[9.7.2 Marker Annotations 331
[9.7.3 Single-Element Annotations 332
[9.7.4 Where Annotations May Appear 333
[9.7.5 Multiple Annotations of the Same Type 338
9.8 Functional Interfaces
9.9 Function Types
10 Arrays
10.1 Array Types
10.2 Array Variables
10.3 Array Creation
10.4 Array Access
10.5 Array Store Exception
10.6 Array Initializers
10.7 Array Members
10.8 Class Objects for Arrays
10.9 An Array of Characters Is Not a String
11 Exceptions
11.1 The Kinds and Causes of Exceptions
[11.1.1 The Kinds of Exceptions 362
[11.1.2 The Causes of Exceptions 363
[11.1.3 Asynchronous Exceptions 364
11.2 Compile-Time Checking of Exceptions
[11.2.1 Exception Analysis of Expressions 366
[11.2.2 Exception Analysis of Statements 367
[11.2.3 Exception Checking 368
11.3 Run-Time Handling of an Exception
12 Execution
12.1 Java Virtual Machine Startup
[12.1.1 Load the Class Test 376
[12.1.2 Link Test: Verify, Prepare, (Optionally) Resolve 376
[12.1.3 Initialize Test: Execute Initializers 377
[12.1.4 Invoke Test.main 378
12.2 加载类和接口
12.2.1 加载过程
12.3 Linking of Classes and Interfaces
[12.3.1 Verification of the Binary Representation 380
[12.3.2 Preparation of a Class or Interface Type 381
[12.3.3 Resolution of Symbolic References 381
12.4 Initialization of Classes and Interfaces
[12.4.1 When Initialization Occurs 383
[12.4.2 Detailed Initialization Procedure 386
12.5 Creation of New Class Instances
12.6 Finalization of Class Instances
[12.6.1 Implementing Finalization 393
[12.6.2 Interaction with the Memory Model 394
12.7 Unloading of Classes and Interfaces
12.8 Program Exit
13 Binary Compatibility
13.1 The Form of a Binary
13.2 What Binary Compatibility Is and Is Not
13.3 Evolution of Packages and Modules
13.4 Evolution of Classes
[13.4.1 abstract Classes 408
[13.4.2 final Classes 409
[13.4.3 public Classes 409
[13.4.4 Superclasses and Superinterfaces 409
[13.4.5 Class Type Parameters 411
[13.4.6 Class Body and Member Declarations 411
[13.4.7 Access to Members and Constructors 413
[13.4.8 Field Declarations 414
[13.4.9 final Fields and static Constant Variables
[13.4.10 static Fields 417
[13.4.11 transient Fields 417
[13.4.12 Method and Constructor Declarations 417
[13.4.13 Method and Constructor Type Parameters 418
[13.4.14 Method and Constructor Formal Parameters 419
[13.4.15 Method Result Type 420
[13.4.16 abstract Methods 420
[13.4.17 final Methods 421
[13.4.18 native Methods 421
[13.4.19 static Methods 422
[13.4.20 synchronized Methods 422
[13.4.21 Method and Constructor Throws 422
[13.4.22 Method and Constructor Body 422
[13.4.23 Method and Constructor Overloading 422
[13.4.24 Method Overriding 424
[13.4.25 Static Initializers 424
[13.4.26 Evolution of Enums 424
13.5 Evolution of Interfaces
[13.5.1 public Interfaces 424
[13.5.2 Superinterfaces 425
[13.5.3 Interface Members 425
[13.5.4 Interface Type Parameters 425
[13.5.5 Field Declarations 426
[13.5.6 Interface Method Declarations 426
[13.5.7 Evolution of Annotation Types 427
14 Blocks and Statements
14.1 Normal and Abrupt Completion of Statements
14.2 Blocks
14.3 Local Class Declarations
14.4 Local Variable Declaration Statements
[14.4.1 Local Variable Declarators and Types 434
[14.4.2 Execution of Local Variable Declarations 435
14.5 Statements
14.6 The Empty Statement
14.7 Labeled Statements
14.8 Expression Statements
14.9 The if Statement
[14.9.1 The if-then Statement 441
[14.9.2 The if-then-else Statement 441
14.10 The assert Statement
14.11 The switch Statement
14.12 The while Statement
[14.12.1 Abrupt Completion of while Statement 449
14.13 The do Statement
[14.13.1 Abrupt Completion of do Statement 451
14.14 The for Statement
[14.14.1 The basic for Statement 452
[14.14.2 The enhanced for statement 455
14.15 The break Statement
14.16 The continue Statement
14.17 The return Statement
14.18 The throw Statement
14.19 The synchronized Statement
14.20 The try statement
[14.20.1 Execution of try-catch 470
[14.20.2 Execution of try-finally and try-catch-finally 471
[14.20.3 try-with-resources 473
14.21 Unreachable Statements
15 Expressions
15.1 Evaluation, Denotation, and Result
15.2 Forms of Expressions
15.3 Type of an Expression
15.4 FP-strict Expressions
15.5 Expressions and Run-Time Checks
15.6 Normal and Abrupt Completion of Evaluation
15.7 Evaluation Order
[15.7.1 Evaluate Left-Hand Operand First 494
[15.7.2 Evaluate Operands before Operation 496
[15.7.3 Evaluation Respects Parentheses and Precedence 497
[15.7.4 Argument Lists are Evaluated Left-to-Right 498
[15.7.5 Evaluation Order for Other Expressions 499
15.8 Primary Expressions
[15.8.1 Lexical Literals 500
[15.8.2 Class Literals 501
[15.8.3 this 502
[15.8.4 Qualified this 503
[15.8.5 Parenthesized Expressions 503
15.9 Class Instance Creation Expressions
[15.9.1 Determining the Class being Instantiated 506
[15.9.2 Determining Enclosing Instances 507
[15.9.3 Choosing the Constructor and its Arguments 509
[15.9.4 Run-Time Evaluation of Class Instance Creation
[15.9.5 Anonymous Class Declarations 514
[15.9.5.1 Anonymous Constructors 515
15.10 Array Creation and Access Expressions
[15.10.1 Array Creation Expressions 516
[15.10.2 Run-Time Evaluation of Array Creation Expressions 517
[15.10.3 Array Access Expressions 521
[15.10.4 Run-Time Evaluation of Array Access Expressions 521
15.11 Field Access Expressions
[15.11.1 Field Access Using a Primary 524
[15.11.2 Accessing Superclass Members using super 527
15.12 Method Invocation Expressions
[15.12.1 Compile-Time Step 1: Determine Class or Interface to Search 530
[15.12.2 Compile-Time Step 2: Determine Method Signature 532
[15.12.3 Compile-Time Step 3: Is the Chosen Method Appropriate? 548
[15.12.4 Run-Time Evaluation of Method Invocation 551
15.13 Method Reference Expressions
[15.13.1 Compile-Time Declaration of a Method Reference 564
[15.13.2 Type of a Method Reference 569
[15.13.3 Run-Time Evaluation of Method References 571
15.14 Postfix Expressions
[15.14.1 Expression Names 575
[15.14.2 Postfix Increment Operator ++ 575
[15.14.3 Postfix Decrement Operator -- 575
15.15 Unary Operators
[15.15.1 Prefix Increment Operator ++ 578
[15.15.2 Prefix Decrement Operator -- 578
[15.15.3 Unary Plus Operator + 579
[15.15.4 Unary Minus Operator - 579
[15.15.5 Bitwise Complement Operator ~ 580
[15.15.6 Logical Complement Operator ! 580
15.16 Cast Expressions
15.17 Multiplicative Operators
[15.17.1 Multiplication Operator * 583
[15.17.2 Division Operator / 584
[15.17.3 Remainder Operator % 585
15.18 Additive Operators
[15.18.1 String Concatenation Operator + 588
[15.18.2 Additive Operators (+ and -) for Numeric Types 591
15.19 Shift Operators
15.20 Relational Operators
[15.20.1 Numerical Comparison Operators <, <=, >, and >= 594
[15.20.2 Type Comparison Operator instanceof 596
15.21 Equality Operators
[15.21.1 Numerical Equality Operators == and != 597
[15.21.2 Boolean Equality Operators == and != 598
[15.21.3 Reference Equality Operators == and != 599
[15.22 Bitwise and Logical Operators 599
[15.22.1 Integer Bitwise Operators &, ^, and | 600
[15.22.2 Boolean Logical Operators &, ^, and | 601
15.23 Conditional-And Operator &&
15.24 Conditional-Or Operator ||
15.25 Conditional Operator ? :
[15.25.1 Boolean Conditional Expressions 610
[15.25.2 Numeric Conditional Expressions 610
[15.25.3 Reference Conditional Expressions 611
15.26 Assignment Operators
[15.26.1 Simple Assignment Operator = 613
[15.26.2 Compound Assignment Operators 619
15.27 Lambda Expressions
[15.27.1 Lambda Parameters 627
[15.27.2 Lambda Body 631
[15.27.3 Type of a Lambda Expression 634
[15.27.4 Run-Time Evaluation of Lambda Expressions 636
15.28 Constant Expressions
16 Definite Assignment
16.1 Definite Assignment and Expressions
[16.1.1 Boolean Constant Expressions 645
[16.1.2 Conditional-And Operator && 645
[16.1.3 Conditional-Or Operator || 646
[16.1.4 Logical Complement Operator ! 646
[16.1.5 Conditional Operator ? : 646
[16.1.6 Conditional Operator ? : 647
[16.1.7 Other Expressions of Type boolean 647
[16.1.8 Assignment Expressions 647
[16.1.9 Operators ++ and -- 648
[16.1.10 Other Expressions 648
16.2 Definite Assignment and Statements
[16.2.1 Empty Statements 650
[16.2.2 Blocks 650
[16.2.3 Local Class Declaration Statements 651
[16.2.4 Local Variable Declaration Statements 651
[16.2.5 Labeled Statements 652
[16.2.6 Expression Statements 652
[16.2.7 if Statements 652
[16.2.8 assert Statements 653
[16.2.9 switch Statements 653
[16.2.10 while Statements 654
[16.2.11 do Statements 654
[16.2.12 for Statements 654
[16.2.12.1 Initialization Part of for Statement 655
[16.2.12.2 Incrementation Part of for Statement 656
[16.2.13 break, continue, return, and throw Statements 656
[16.2.14 synchronized Statements 656
[16.2.15 try Statements 657
16.3 Definite Assignment and Parameters
16.4 Definite Assignment and Array Initializers
16.5 Definite Assignment and Enum Constants
16.6 Definite Assignment and Anonymous Classes
16.7 Definite Assignment and Member Types
16.8 Definite Assignment and Static Initializers
16.9 Definite Assignment, Constructors, and Instance Initializers
17 Threads and Locks
17.1 Synchronization
17.2 Wait Sets and Notification
[17.2.1 Wait 665
[17.2.2 Notification 666
[17.2.3 Interruptions 667
[17.2.4 Interactions of Waits, Notification, and Interruption 667
17.3 Sleep and Yield
17.4 Memory Model
[17.4.1 Shared Variables 672
[17.4.2 Actions 672
[17.4.3 Programs and Program Order 673
[17.4.4 Synchronization Order 674
[17.4.5 Happens-before Order 675
[17.4.6 Executions 678
[17.4.7 Well-Formed Executions 679
[17.4.8 Executions and Causality Requirements 679
[17.4.9 Observable Behavior and Nonterminating Executions 682
17.5 final Field Semantics
[17.5.1 Semantics of final Fields 686
[17.5.2 Reading final Fields During Construction 686
[17.5.3 Subsequent Modification of final Fields 687
[17.5.4 Write-Protected Fields 688
17.6 Word Tearing
17.7 Non-Atomic Treatment of double and long
18 Type Inference
18.1 Concepts and Notation
[18.1.1 Inference Variables 692
[18.1.2 Constraint Formulas 693
[18.1.3 Bounds 693
18.2 Reduction
[18.2.1 Expression Compatibility Constraints 695
[18.2.2 Type Compatibility Constraints 700
[18.2.3 Subtyping Constraints 701
[18.2.4 Type Equality Constraints 702
[18.2.5 Checked Exception Constraints 704
18.3 Incorporation
[18.3.1 Complementary Pairs of Bounds 707
[18.3.2 Bounds Involving Capture Conversion 707
18.4 Resolution
18.5 Uses of Inference
[18.5.1 Invocation Applicability Inference 710
[18.5.2 Invocation Type Inference 712
[18.5.2.1 Poly Method Invocation Compatibility 712
[18.5.2.2 Additional Argument Constraints 715
[18.5.3 Functional Interface Parameterization Inference 719
[18.5.4 More Specific Method Inference 720
19 Syntax
To be continued ...未完待续...
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14.9 The if Statement
14.9 The if Statement
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