README.md

Questions & Solutions 💡

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Looping 👩‍💻

Java For Loop

When you know exactly how many times you want to loop through a block of code, use the for loop instead of a while loop:

Syntax 👇

for (statement 1; statement 2; statement 3) {
  // code block to be executed
}

Example

for (int i = 0; i < 5; i++) {
  System.out.println(i);
}

Statement 1 sets a variable before the loop starts int i = 0.

Statement 2 defines the condition for the loop to run (i must be less than 5). If the condition is true, the loop will start over again, if it is false, the loop will end.

Statement 3 increases a value i++ each time the code block in the loop has been executed.

Java While Loop

The while loop loops through a block of code as long as a specified condition is true:

Syntax 👇

while (condition) {
  // code block to be executed
}

Example

In the example below, the code in the loop will run, over and over again, as long as a variable i is less than 5:

int i = 0;
while (i < 5) {
  System.out.println(i);
  i++;
}

For Loop Vs While Loop

Comparison	For	While
When to use	Used only when we already knew the number of iterations	Used only when the number of iteration are not exactly known