Introduction

Iterations in essence is counting. You have to repeatedly do a task a certain number of times and the conditions within your loops determines how many times you do it. Whether you’re dealing with a for loop or a while loop you will need the following to count properly:

• A variable initialized for the sole purpose of counting in a loop
• A condition: you will stop iterating once the variable breaks this condition
• Step: define by how much the variable you are using will increase and decrease at each iteration.

For Loop

Check this video for visualization of the for loop:

https://www.youtube.com/watch?v=Hj0czMprXhc

Example 1: increment by 1

for (int i=0; i<3; i++){
	System.out.println(i);
}
// rest of the code

• i is the variable initialized for the loop
• i<3 is the condition for the loop. The loop will run only if this condition is true
• i++ is the step: here we are incrementing i by 1 each time.
• Walkthrough of Example 1

Example 2: decrement by 1

for (int i=3; i>0; i--){
	System.out.println(i);
}
// rest of the code

• i is the variable initialized for the loop
• i>0 is the condition for the loop. The loop will run only if this condition is true
• i-- is the step: here we are decrementing i by 1 each time.