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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