BLOCKS AND STATEMENTS

Iteration of

for

 statement

14.12.2

14.12.1   Initialization of

for

 statement

A

for

 statement is executed by first executing the

ForInit

 code:

If the

ForInit

 code is a list of statement expressions ( 14.7), the expressions

are evaluated in sequence from left to right; their values, if any, are discarded.

If evaluation of any expression completes abruptly for some reason, the

for

statement completes abruptly for the same reason; any

ForInit

 statement

expressions to the right of the one that completed abruptly are not evaluated.

If the

ForInit

 code is a local variable declaration, it is executed as if it were a

local variable declaration statement ( 14.3) appearing in a block. In this case,

the scope of a declared local variable is its own initializer and any further

declarators in the

ForInit

 part, plus the

Expression

,

ForUpdate

, and contained

Statement

 of the

for

 statement. If execution of the local variable declaration

completes abruptly for any reason, the

for

 statement completes abruptly for

the same reason.

If the

ForInit

 part is not present, no action is taken.

14.12.2   Iteration of

for

 statement

Next, a

for

 iteration step is performed, as follows:

If the

Expression

 is present, it is evaluated, and if evaluation of the

Expression

completes abruptly, the

for

 statement completes abruptly for the same rea 

son. Otherwise, there is then a choice based on the presence or absence of the

Expression

 and the resulting value if the

Expression

 is present:

N

If the

Expression

 is not present, or it is present and the value resulting from

its evaluation is

true

, then the contained

Statement

 is executed. Then there

is a choice:

O

If execution of the

Statement

 completes normally, then the following two

steps are performed in sequence:

First, if the

ForUpdate

 part is present, the expressions are evaluated in

sequence from left to right; their values, if any, are discarded. If evalua 

tion of any expression completes abruptly for some reason, the

for

statement completes abruptly for the same reason; any

ForUpdate

 state 

ment expressions to the right of the one that completed abruptly are not

evaluated. If the

ForUpdate

 part is not present, no action is taken.

Second, another

for

 iteration step is performed.

O

If execution of the

Statement

 completes abruptly, see  14.12.3 below.

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