1. Types of loops
definite loop: A loop that executes a known number of times.
Examples:
Repeat these statements 10 times.
Repeat these statements k times.
Repeat these statements for each odd number between 5 and 27.
indefinite loop: A loop where it is not easy to know how many times it will execute.
Repeat these statements until the user types a valid integer.
Repeat these statements while the number n is not prime.
Repeat these statements until a factor of n is found.

2. The while loop statement
The while loop is a new loop statement useful for writing indefinite loops.
The while loop, general syntax:
while (<condition>) {
<statement(s)> ; }
Example:
int number = 1;
while (number <= 200) {
System.out.print(number + " ");
number *= 2;
OUTPUT: