JLS中表达式的所有文法

3.8. Identifiers

Identifier:
    IdentifierChars but not a Keyword or BooleanLiteral or NullLiteral

IdentifierChars:
    JavaLetter
    IdentifierChars JavaLetterOrDigit

JavaLetter:
    any Unicode character that is a Java letter (see below)

JavaLetterOrDigit:
    any Unicode character that is a Java letter-or-digit (see below)

15.8. Primary Expressions

Primary:
    PrimaryNoNewArray
    ArrayCreationExpression

PrimaryNoNewArray:
    Literal
    Type . class
    void . class
    this
    ClassName . this
    ( Expression )
    ClassInstanceCreationExpression
    FieldAccess
    MethodInvocation
    ArrayAccess

15.8.1. Lexical Literals

Literal:
    IntegerLiteral
    FloatingPointLiteral
    BooleanLiteral
    CharacterLiteral
    StringLiteral
    NullLiteral

15.9. Class Instance Creation Expressions

ClassInstanceCreationExpression:
    new TypeArgumentsopt TypeDeclSpecifier TypeArgumentsOrDiamondopt
                                                            ( ArgumentListopt ) ClassBodyopt
    Primary . new TypeArgumentsopt Identifier TypeArgumentsOrDiamondopt
                                                            ( ArgumentListopt ) ClassBodyopt

TypeArgumentsOrDiamond:
    TypeArguments
    <> 

ArgumentList:
    Expression
    ArgumentList , Expression

15.10. Array Creation Expressions

ArrayCreationExpression:
    new PrimitiveType DimExprs Dimsopt
    new ClassOrInterfaceType DimExprs Dimsopt
    new PrimitiveType Dims ArrayInitializer
    new ClassOrInterfaceType Dims ArrayInitializer

DimExprs:
    DimExpr
    DimExprs DimExpr

DimExpr:
    [ Expression ]

Dims:
    [ ]
    Dims [ ]

15.11. Field Access Expressions

FieldAccess:
    Primary . Identifier
    super . Identifier
    ClassName . super . Identifier

15.12. Method Invocation Expressions

MethodInvocation:
    MethodName ( ArgumentListopt )
    Primary . NonWildTypeArgumentsopt Identifier ( ArgumentListopt )
    super . NonWildTypeArgumentsopt Identifier ( ArgumentListopt )
    ClassName . super . NonWildTypeArgumentsopt Identifier ( ArgumentListopt )
    TypeName . NonWildTypeArguments Identifier ( ArgumentListopt )

The definition of ArgumentList from §15.9 is repeated here for convenience:　　

ArgumentList:
    Expression
    ArgumentList , Expression

15.13. Array Access Expressions

ArrayAccess:
    ExpressionName [ Expression ]
    PrimaryNoNewArray [ Expression ]

15.14. Postfix Expressions

PostfixExpression:
    Primary
    ExpressionName
    PostIncrementExpression
    PostDecrementExpression

15.14.2. Postfix Increment Operator `++`

PostIncrementExpression:
    PostfixExpression ++

15.14.3. Postfix Decrement Operator `--`

PostDecrementExpression:
    PostfixExpression --

15.15. Unary Operators

UnaryExpression:
    PreIncrementExpression
    PreDecrementExpression
    + UnaryExpression
    - UnaryExpression
    UnaryExpressionNotPlusMinus

PreIncrementExpression:
    ++ UnaryExpression

PreDecrementExpression:
    -- UnaryExpression

UnaryExpressionNotPlusMinus:
    PostfixExpression
    ~ UnaryExpression
    ! UnaryExpression
    CastExpression

15.16. Cast Expressions

CastExpression:
    ( PrimitiveType ) UnaryExpression
    ( ReferenceType ) UnaryExpressionNotPlusMinus

15.17. Multiplicative Operators

MultiplicativeExpression:
    UnaryExpression
    MultiplicativeExpression * UnaryExpression
    MultiplicativeExpression / UnaryExpression
    MultiplicativeExpression % UnaryExpression

15.18. Additive Operators

AdditiveExpression:
    MultiplicativeExpression
    AdditiveExpression + MultiplicativeExpression
    AdditiveExpression - MultiplicativeExpression

15.19. Shift Operators

ShiftExpression:
    AdditiveExpression
    ShiftExpression << AdditiveExpression
    ShiftExpression >> AdditiveExpression
    ShiftExpression >>> AdditiveExpression

15.20. Relational Operators

RelationalExpression:
    ShiftExpression
    RelationalExpression < ShiftExpression
    RelationalExpression > ShiftExpression
    RelationalExpression <= ShiftExpression
    RelationalExpression >= ShiftExpression
    RelationalExpression instanceof ReferenceType

15.21. Equality Operators

EqualityExpression:
    RelationalExpression
    EqualityExpression == RelationalExpression
    EqualityExpression != RelationalExpression

15.22. Bitwise and Logical Operators

AndExpression:
    EqualityExpression
    AndExpression & EqualityExpression

ExclusiveOrExpression:
    AndExpression
    ExclusiveOrExpression ^ AndExpression

InclusiveOrExpression:
    ExclusiveOrExpression
    InclusiveOrExpression | ExclusiveOrExpression

15.23. Conditional-And Operator `&&`

ConditionalAndExpression:
    InclusiveOrExpression
    ConditionalAndExpression && InclusiveOrExpression

15.24. Conditional-Or Operator `||`

ConditionalOrExpression:
    ConditionalAndExpression
    ConditionalOrExpression || ConditionalAndExpression

15.25. Conditional Operator `? :`

ConditionalExpression:
    ConditionalOrExpression
    ConditionalOrExpression ? Expression : ConditionalExpression

15.26. Assignment Operators

AssignmentExpression:
    ConditionalExpression
    Assignment

Assignment:
    LeftHandSide AssignmentOperator AssignmentExpression

LeftHandSide:
    ExpressionName
    FieldAccess
    ArrayAccess

AssignmentOperator: one of
    = *= /= %= += -= <<= >>= >>>= &= ^= |=

15.27. Expression

Expression:
    AssignmentExpression

15.28. Constant Expressions

ConstantExpression:
    Expression

StatementExpression:
    Assignment
    PreIncrementExpression
    PreDecrementExpression
    PostIncrementExpression
    PostDecrementExpression
    MethodInvocation
    ClassInstanceCreationExpression

Primary:
    PrimaryNoNewArray
    ArrayCreationExpression
        new PrimitiveType DimExprs Dimsopt
	new ClassOrInterfaceType DimExprs Dimsopt
	new PrimitiveType Dims ArrayInitializer
	new ClassOrInterfaceType Dims ArrayInitializer

PrimaryNoNewArray:
    ( Expression )
    Literal

    this
    ClassName . this

    Type . class
    void . class
    ClassInstanceCreationExpression
        new TypeArgumentsopt TypeDeclSpecifier TypeArgumentsOrDiamondopt
                                                       ( ArgumentListopt ) ClassBodyopt
        Primary . new TypeArgumentsopt Identifier TypeArgumentsOrDiamondopt
                                                       ( ArgumentListopt ) ClassBodyopt
    FieldAccess
        Primary . Identifier
        super . Identifier
        ClassName . super . Identifier
    MethodInvocation
	MethodName ( ArgumentListopt )
	Primary . NonWildTypeArgumentsopt Identifier ( ArgumentListopt )
	super . NonWildTypeArgumentsopt Identifier ( ArgumentListopt )
	ClassName . super . NonWildTypeArgumentsopt Identifier ( ArgumentListopt )
	TypeName . NonWildTypeArguments Identifier ( ArgumentListopt )
    ArrayAccess
        ExpressionName [ Expression ]
        PrimaryNoNewArray [ Expression ]

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JLS中表达式的所有文法

3.8. Identifiers

15.8. Primary Expressions

15.8.1. Lexical Literals

15.9. Class Instance Creation Expressions

15.10. Array Creation Expressions

15.11. Field Access Expressions

15.12. Method Invocation Expressions

15.13. Array Access Expressions

15.14. Postfix Expressions

15.14.2. Postfix Increment Operator ++

15.14.3. Postfix Decrement Operator --

15.15. Unary Operators

15.16. Cast Expressions

15.17. Multiplicative Operators

15.18. Additive Operators

15.19. Shift Operators

15.20. Relational Operators

15.21. Equality Operators

15.22. Bitwise and Logical Operators

15.23. Conditional-And Operator &&

15.24. Conditional-Or Operator ||

15.25. Conditional Operator ? :

15.26. Assignment Operators

15.27. Expression

15.28. Constant Expressions

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热门专题

15.14.2. Postfix Increment Operator `++`

15.14.3. Postfix Decrement Operator `--`

15.23. Conditional-And Operator `&&`

15.24. Conditional-Or Operator `||`

15.25. Conditional Operator `? :`