Skip to Content
Learn Java: Loops
Incrementing While Loops

When looping through code, it’s common to use a counter variable. A counter (also known as an iterator) is a variable used in the conditional logic of the loop and (usually) incremented in value during each iteration through the code. For example:

// counter is initialized int wishes = 0; // conditional logic uses counter while (wishes < 3) { System.out.println("Wish granted."); // counter is incremented wishes++; }

In the above example, the counter wishes gets initialized before the loop with a value of 0, then the program will keep printing "Wish granted." and adding 1 to wishes as long as wishes has a value of less than 3. Once wishes reaches a value of 3 or more, the program will exit the loop.

So the output would look like:

Wish granted. Wish granted. Wish granted.

We can also decrement counters like this:

int pushupsToDo = 10; while (pushupsToDo > 0) { doPushup(); pushupsToDo--; }

In the code above, the counter, pushupsToDo, starts at 10, and increments down one at a time. When it hits 0, the loop exits.



In, initialize an int variable called cupsOfCoffee with a value of 1.


Create a while loop that runs as long as cupsOfCoffee is less than or equal to 100.

Important: Inside the while loop, increment cupsOfCoffee by 1 to prevent an infinite loop.


Inside the while loop above where you incremented cupsOfCoffee print the following:

Fry drinks cup of coffee #1

The 1 in this statement should correspond with the current value of cupsOfCoffee. When cupsOfCoffee is 100, this should be printed:

Fry drinks cup of coffee #100
Folder Icon

Take this course for free

Already have an account?