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The JLS provides the following example of the enhanced for statement in §14.14.2, "The Enhanced for Statement" [JLS 2014]:

 

Wiki Markup

The

enhanced

for

statement

is

equivalent

to

a

basic

for

statement

of

the

form:

Code Block
for (I \#i = Expression.iterator(); \#i.hasNext(); ) [{ {VariableModifier} TargetType Identifier = (TargetType) \#i.next(); Statement \} \#i is an automatically generated identifier that is distinct from any other identifiers (automatically generated or otherwise) that are in

#i is an automatically generated identifier that is distinct from any other identifiers (automatically generated or otherwise) that are in scope...at

the

point

where

the

enhanced

for

statement

occurs.

 

Unlike the basic for statement, assignments to the loop variable fail to affect the loop's iteration order over the underlying set of objects. Consequently, an assignment to the loop variable is equivalent to modifying a variable local to the loop body whose initial value is the object referenced by the loop iterator. This modification is not necessarily erroneous, but can obscure the loop functionality or indicate a misunderstanding of the underlying implementation of the enhanced for statement.

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