Java Reference
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1. First, if the ForUpdate part is present, the expressions are evaluated in se-
quence from left to right; their values, if any, are discarded. If evaluation of
any expression completes abruptly for some reason, the for statement com-
pletes abruptly for the same reason; any ForUpdate statement expressions to
the right of the one that completed abruptly are not evaluated.
If the ForUpdate part is not present, no action is taken.
2. Second, another for iteration step is performed.
♦ If execution of the Statement completes abruptly, see § 14.14.1.3 .
• If the Expression is present and the value resulting from its evaluation (including
any possible unboxing) is false , no further action is taken and the for statement
completes normally.
If the (possibly unboxed) value of the Expression is false the first time it is eval-
uated, then the Statement is not executed.
If the Expression is not present, then the only way a for statement can complete normally is
by use of a break statement.
14.14.1.3. Abrupt Completion of for Statement
Abrupt completion of the contained Statement is handled in the following manner:
• If execution of the Statement completes abruptly because of a break with no label,
no further action is taken and the for statement completes normally.
• If execution of the Statement completes abruptly because of a continue with no la-
bel, then the following two steps are performed in sequence:
1. First, if the ForUpdate part is present, the expressions are evaluated in se-
quence from left to right; their values, if any, are discarded.
If the ForUpdate part is not present, no action is taken.
2. Second, another for iteration step is performed.
• If execution of the Statement completes abruptly because of a continue with label L ,
then there is a choice:
♦ If the for statement has label L , then the following two steps are performed in
sequence:
1. First, if the ForUpdate part is present, the expressions are evaluated in se-
quence from left to right; their values, if any, are discarded.
If the ForUpdate is not present, no action is taken.
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