Data Structures and Algorithms in Java[1].pdf - Fulvio Frisone

Defining a For Loop
Here is the syntax for a Java for loop:
for (initialization; condition; increment)
loop_statement
where each of the sections initialization, condition, and increment can be empty.
In the initialization section, we can declare an index variable that will only exist
in the scope of the for loop. For example, if we want a loop that indexes on a
counter, and we have no need for the counter variable outside of the for loop,
then declaring something like the following
for (int counter = 0; condition; increment)
loop_statement
will declare a variable counter whose scope is the loop body only.
In the condition section, we specify the repeat (while) condition of the loop. This
must be a Boolean expression. The body of the for loop will be executed each
time the condition is true when evaluated at the beginning of a potential
iteration. As soon as condition evaluates to false, then the loop body is not
executed, and, instead, the program executes the next statement after the for
loop.
In the increment section, we declare the incrementing statement for the loop. The
incrementing statement can be any legal statement, allowing for significant
flexibility in coding. Thus, the syntax of a for loop is equivalent to the
following:
initialization;
while (condition) {
}
loop_statement;
increment;
except that, in Java, a while loop cannot have an empty Boolean condition,
whereas a for loop can. The following example shows a simple for loop in
Java:
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