for Loop

1. What is a for Loop?

A for loop repeats a block of code a specific number of times. It combines initialization, a condition, and an update step, all in one compact line.

2. Why is it used?

Many tasks need repetition with a known count — like printing numbers from 1 to 10, or going through every item in a list. The for loop handles this kind of repetition cleanly.

3. Real-Life Example

Think of a teacher calling out roll numbers from 1 to 40 one by one during attendance. There's a clear starting point, an ending point, and a fixed step (increase by 1 each time) — exactly how a for loop works.

4. Syntax

java
for (initialization; condition; update) {
    // code to repeat
}

5. Example Program

java
public class ForLoopDemo {
    public static void main(String[] args) {
        for (int i = 1; i <= 5; i++) {
            System.out.println("Count: " + i);
        }
    }
}

Output:

Count: 1
Count: 2
Count: 3
Count: 4
Count: 5

6. Key Points to Remember

• The three parts (initialization, condition, update) are all optional individually, but the two semicolons are always required.
• The loop keeps running as long as the condition remains true.
• A missing or wrong update step can cause an infinite loop.