15.6.1

Evaluate Left Hand Operand First

EXPRESSIONS

Thus:

class Test {

public static void main(String[] args) {

int i = 2;

int j = (i=3) * i;

System.out.println(j);

}

}

prints:

9

It is not permitted for it to print

6

 instead of

9

.

If the operator is a compound assignment operator ( 15.25.2), 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:

class Test {

public static void main(String[] args) {

int a = 9;

a += (a = 3);

//

first example

System.out.println(a);

int b = 9;

b = b + (b = 3);

//

second example

System.out.println(b);

}

}

prints:

12

12

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

evaluated, thereby setting the variable to

3

. It is not permitted for either example

to produce the result

6

. Note that both of these examples have unspecified behav 

ior in C, according to the ANSI/ISO standard.

If evaluation of the left hand operand of a binary operator completes abruptly,

no part of the right hand operand appears to have been evaluated.

Thus, the test program:

306