JAVA PROGRAMMING
Iteration
Statements ( do-while, while, for)
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The while statement
You use a while statement to continually
execute a block of statements while a condition remains true. The general
syntax of the while statement is:
while (expression) {
statement
}
First, the while statement evaluates expression, which must return a
boolean value. If the expression returns true, then the while statement
executes the statement(s) associated with it. The while statement
continues testing the expression and executing statements until the
expression returns false.
A sample code using while
The do-while statement
Java provides another statement that is similar to
the while statement--the do-while statement. The general syntax of the
do-while is:
do {
statement
} while (expression);
Instead of evaluating the expression at the top of the loop, do-while
evaluates the expression at the bottom. Thus the statements associated
with a do-while are executed at least once.
A sample code using do-while
The for
statement
The for statement provides a compact way to iterate
over a range of values. The general form of the for statement can be
expressed like this:
for (initialization; termination; increment) {
statement
}
initialization is a statement that initializes the loop--it's executed
once at the beginning of the loop. termination is an expression that
determines when to terminate the loop. This expression is evaluated at the
top of each iteration of the loop. When the expression evaluates to false,
the loop terminates. Finally, increment is an expression that gets invoked
for each iteration through the loop. Any (or all) of these components can
be empty statements.
A sample code using for
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