Java For Loop

For loops are particularly useful when the number of iterations is known beforehand. Instead of using a while loop, the for loop provides a concise and clear way to iterate through a block of code a specific number of times.

Syntax

for (initialization; condition; increment) {
  // code block to be executed
}

for (initialization; condition; increment) {

  // code block to be executed

}

Initialization: This is executed once before the loop starts.
Condition: Defines the condition for executing the code block.
Increment: Executes after the code block has been executed every time.

Example

The following example prints numbers from 0 to 4:

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

for (int counter = 0; counter < 5; counter++) {

  System.out.println(counter);

}

Example Explained:

• Initialization: Sets a variable (int counter = 0) before the loop starts.
• Condition: Determines the condition for the loop to run (counter must be less than 5). If true, the loop continues; if false, the loop ends.
• Increment: Increases the variable (counter++) after each iteration of the loop.

Another Example

This example prints even numbers between 0 and 10:

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

for (int index = 0; index <= 10; index = index + 2) {

  System.out.println(index);

}