While Loops

Example:

int x = 1;
while (x < 5)
{
 System.out.println("Looping");
 x = x + 1;
}
System.out.println("Done");

Infinite Loops

One easy mistake to make when working with loops is accidently creating an infinite loop. An infinite, or endless, loop is a loop that never exits and loops forever, or at least until the power goes out. There are two main types of infinite loops:

Always have an exit condition defined, either within the loop itself or with a break statement.

Break Statements

You can use a break to exit a loop early

Example:

x = 1;
while (x < 5) 
{
 if (x == 3) 
 {
 break;
 }
 System.out.println("Looping");
 x = x + 1;
}
System.out.println("Done");

How it work:

Practice

What would the following program output?

x = 0;
System.out.println("A");
while (x <= 3) 
{
 System.out.println("B");
 x = x + 1;
}
System.out.println("C")

How it work: