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

Another important control flow mechanism in a programming language is looping.
Java provides for three types of loops.
While Loops
The simplest kind of loop in Java is a while loop. Such a loop tests that a certain
condition is satisfied and will perform the body of the loop each time this
condition is evaluated to be true. The syntax for such a conditional test before a
loop body is executed is as follows:
while (boolean_exp)
loop_statement
At the beginning of each iteration, the loop tests the expression, boolean exp, and
then executes the loop body, loop_statement, only if this Boolean expression
evaluates to true. The loop body statement can also be a block of statements.
Consider, for example, a gnome that is trying to water all of the carrots in his
carrot patch, which he does as long as his watering can is not empty. Since his can
might be empty to begin with, we would write the code to perform this task as
follows:
public void waterCarrots () {
}
Carrot current = garden.findNextCarrot ();
while (!waterCan.isEmpty ()) {
}
water (current, waterCan);
current = garden.findNextCarrot ();
Recall that "!" in Java is the "not" operator.
For Loops
Another kind of loop is thefor loop. In their simplest form, for loops provide
for repeated code based on an integer index. In Java, we can do that and much
more. The functionality of a for loop is significantly more flexible. In particular,
the usage of a for loop is split into four sections: the initialization, the condition,
the increment, and the body.
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