Normal and Abrupt Completion of Evaluation in Java

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156 Normal and Abrupt Completion of Evaluation
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A class instance creation expression ( 159), array creation expression ( 1510), or string concatenation operator expression ( 15181) throws an OutOfMemoryError if there is insuf cient memory available An array creation expression throws a NegativeArraySizeException if the value of any dimension expression is less than zero ( 1510)
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A eld access ( 1511) throws a NullPointerException if the value of the object reference expression is null A method invocation expression ( 1512) that invokes an instance method throws a NullPointerException if the target reference is null
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An array access ( 1513) throws a NullPointerException if the value of the array reference expression is null An array access ( 1513) throws an ArrayIndexOutOfBoundsException if the value of the array index expression is negative or greater than or equal to the length of the array
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Every expression has a normal mode of evaluation in which certain computational steps are carried out The following sections describe the normal mode of evaluation for each kind of expression If all the steps are carried out without an exception being thrown, the expression is said to complete normally If, however, evaluation of an expression throws an exception, then the expression is said to complete abruptly An abrupt completion always has an associated reason, which is always a throw with a given value Run-time exceptions are thrown by the prede ned operators as follows:
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No more: the end is sudden and abrupt pology for the Foregoing Poems 413
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Evaluation Order
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EXPRESSIONS
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A cast ( 1516) throws a ClassCastException if a cast is found to be impermissible at run time An integer division ( 15172) or integer remainder ( 15173) operator throws an ArithmeticException if the value of the right-hand operand expression is zero An assignment to an array component of reference type ( 15261), a metthod invocation ( 1512), a pre x or post x increment ( 15142, 15151) or decrement operator ( 15143, 15152) may all throw an OutOfMemoryError as a result of boxing conversion ( 517)
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An assignment to an array component of reference type ( 15261) throws an ArrayStoreException when the value to be assigned is not compatible with the component type of the array A method invocation expression can also result in an exception being thrown if an exception occurs that causes execution of the method body to complete abruptly A class instance creation expression can also result in an exception being thrown if an exception occurs that causes execution of the constructor to complete abruptly Various linkage and virtual machine errors may also occur during the evaluation of an expression By their nature, such errors are dif cult to predict and dif cult to handle If an exception occurs, then evaluation of one or more expressions may be terminated before all steps of their normal mode of evaluation are complete; such expressions are said to complete abruptly The terms complete normally and complete abruptly are also applied to the execution of statements ( 141) A statement may complete abruptly for a variety of reasons, not just because an exception is thrown If evaluation of an expression requires evaluation of a subexpression, abrupt completion of the subexpression always causes the immediate abrupt completion of the expression itself, with the same reason, and all succeeding steps in the normal mode of evaluation are not performed
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157 Evaluation Order
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Let all things be done decently and in order I Corinthians 14:40 The Java programming language guarantees that the operands of operators appear to be evaluated in a speci c evaluation order, namely, from left to right
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EXPRESSIONS
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Evaluate Left-Hand Operand First
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It is recommended that code not rely crucially on this speci cation Code is usually clearer when each expression contains at most one side effect, as its outermost operation, and when code does not depend on exactly which exception arises as a consequence of the left-to-right evaluation of expressions 1571 Evaluate Left-Hand Operand First The left-hand operand of a binary operator appears to be fully evaluated before any part of the right-hand operand is evaluated For example, if the left-hand operand contains an assignment to a variable and the right-hand operand contains a reference to that same variable, then the value produced by the reference will re ect the fact that the assignment occurred rst Thus:
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class Test { public static void main(String[] args) { int i = 2; int j = (i=3) * i; Systemoutprintln(j); } }
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It is not permitted for it to print 6 instead of 9 If the operator is a compound-assignment operator ( 15262), then evaluation of the left-hand operand includes both remembering the variable that the left-hand operand denotes and fetching and saving that variable s value for use in the implied combining operation So, for example, the test program:
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class Test { public static void main(String[] args) { int a = 9; a += (a = 3); // rst example Systemoutprintln(a); int b = 9; b = b + (b = 3); // second example Systemoutprintln(b); } } 12 12
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because the two assignment statements both fetch and remember the value of the left-hand operand, which is 9, before the right-hand operand of the addition is