Assignment Operators in Java

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Assignment Operators
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EXPRESSIONS
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At run time, the rst operand expression of the conditional expression is evaluated rst; if necessary, unboxing conversion is performed on the result; the resulting boolean value is then used to choose either the second or the third operand expression: If the value of the rst operand is true, then the second operand expression is chosen If the value of the rst operand is false, then the third operand expression is chosen The chosen operand expression is then evaluated and the resulting value is converted to the type of the conditional expression as determined by the rules stated above This conversion may include boxing ( 517) or unboxing conversion The operand expression not chosen is not evaluated for that particular evaluation of the conditional expression
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There are 12 assignment operators; all are syntactically right-associative (they group right-to-left) Thus, a=b=c means a=(b=c), which assigns the value of c to b and then assigns the value of b to a AssignmentExpression: ConditionalExpression Assignment
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Assignment: LeftHandSide AssignmentOperator AssignmentExpression LeftHandSide: ExpressionName FieldAccess ArrayAccess
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AssignmentOperator: one of
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The result of the rst operand of an assignment operator must be a variable, or a compile-time error occurs This operand may be a named variable, such as a local variable or a eld of the current object or class, or it may be a computed variable, as can result from a eld access ( 1511) or an array access ( 1513) The
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EXPRESSIONS
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Simple Assignment Operator = 15261
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type of the assignment expression is the type of the variable after capture conversion ( 5110) At run time, the result of the assignment expression is the value of the variable after the assignment has occurred The result of an assignment expression is not itself a variable A variable that is declared final cannot be assigned to (unless it is a de nitely unassigned ( 16) blank nal variable ( 4124)), because when an access of such a final variable is used as an expression, the result is a value, not a variable, and so it cannot be used as the rst operand of an assignment operator 15261 Simple Assignment Operator =
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A compile-time error occurs if the type of the right-hand operand cannot be converted to the type of the variable by assignment conversion ( 52) At run time, the expression is evaluated in one of three ways: If the left-hand operand expression is a eld access expression ( 1511) ef, possibly enclosed in one or more pairs of parentheses, then:
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If the left-hand operand is an array access expression ( 1513), possibly enclosed in one or more pairs of parentheses, then: First, the array reference subexpression of the left-hand operand array access expression is evaluated If this evaluation completes abruptly, then the assignment expression completes abruptly for the same reason; the index subexpression (of the left-hand operand array access expression) and the right-hand operand are not evaluated and no assignment occurs Otherwise, the index subexpression of the left-hand operand array access expression is evaluated If this evaluation completes abruptly, then the assignment expression completes abruptly for the same reason and the right-hand operand is not evaluated and no assignment occurs
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First, the expression e is evaluated If evaluation of e completes abruptly, the assignment expression completes abruptly for the same reason
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Next, the right hand operand is evaluated If evaluation of the right hand expression completes abruptly, the assignment expression completes abruptly for the same reason
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Then, if the eld denoted by ef is not static and the result of the evaluation of e above is null, then a NullPointerException is thrown Otherwise, the variable denoted by ef is assigned the value of the right hand operand as computed above
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