> For the complete documentation index, see [llms.txt](https://pankhaniyajay.gitbook.io/introduction-to-programming-fundamentals-java/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pankhaniyajay.gitbook.io/introduction-to-programming-fundamentals-java/loops.md).

# Loops

### For loops

In Java, you can use for loops to execute a block of code repeatedly for a fixed number of times. Here's an example:

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

In the above example, we use a for loop to print the numbers from 1 to 5. The loop starts with an initial value of `i` equal to 1, and executes as long as `i` is less than or equal to 5. The loop increments `i` by 1 after each iteration, using the `i++` shorthand for `i = i + 1`.

You can also use it for loops with arrays, like this:

```java
public class ArrayLoopExample {
    public static void main(String[] args) {
        int[] numbers = {1, 2, 3, 4, 5};

        for (int i = 0; i < numbers.length; i++) {
            System.out.println(numbers[i]);
        }
    }
}
```

In the above example, we use a for loop to iterate over an array of numbers. The loop starts with an initial value of `i` equal to 0, and executes as long as `i` is less than the length of the `numbers` array. The loop increments `i` by 1 after each iteration.

### While loops

In Java, you can use while loops to execute a block of code repeatedly as long as a certain condition is true. Here's an example:

```java
public class WhileLoopExample {
    public static void main(String[] args) {
        int i = 1;

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

In the above example, we use a while loop to print the numbers from 1 to 5. The loop starts with an initial value of `i` equal to 1, and executes as long as `i` is less than or equal to 5. The loop increments `i` by 1 after each iteration.

You can also use while loops with boolean variables, like this:

```java
public class BooleanLoopExample {
    public static void main(String[] args) {
        boolean keepGoing = true;
        int i = 1;

        while (keepGoing) {
            System.out.println(i);

            if (i == 5) {
                keepGoing = false;
            }

            i++;
        }
    }
}
```

In the above example, we use a while loop to print the numbers from 1 to 5, but we use a boolean variable `keepGoing` to control the loop instead of a numeric condition. The loop starts with an initial value of `keepGoing` equal to `true`, and executes as long as `keepGoing` is `true`. The loop sets `keepGoing` to `false` when `i` equals 5, causing the loop to exit.

### Do-while loops

In Java, you can use do-while loops to execute a block of code repeatedly at least once, and then as long as a certain condition is true. Here's an example:

```java
public class DoWhileLoopExample {
    public static void main(String[] args) {
        int i = 1;

        do {
            System.out.println(i);
            i++;
        } while (i <= 5);
    }
}
```

In the above example, we use a do-while loop to print the numbers from 1 to 5. The loop starts by executing the block of code once and then continues to execute as long as `i` is less than or equal to 5. The loop increments `i` by 1 after each iteration.

Do-while loops are useful when you need to execute a block of code at least once, regardless of the condition.

That's an overview of loops, while loops, and do-while loops in Java.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://pankhaniyajay.gitbook.io/introduction-to-programming-fundamentals-java/loops.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.