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
}

• Statement 1 is executed once before the execution of the code block.
• Statement 2 defines the condition for executing the code block.
• Statement 3 is executed every time after the code block has been executed.

The example below will print the numbers 0 to 4:

Example

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

Example Explained

• 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 continues; otherwise, it stops.
• Statement 3 increases a value (i++) each time the code block executes.

Another Example

This example prints only even values between 0 and 10:

for (int i = 0; i <= 10; i = i + 2) {
  System.out.println(i);
}