Java For-Each Loop
Syntax, Flow & Examples

When you're working with arrays or collections in Java, there comes a point where you just want to go through every element—no counters, no fuss. That's where the for-each loop shines. It's Java's way of saying: "Let me handle the iteration, you focus on what needs to be done."

What Is a For-Each Loop?

The for-each loop—also known as the enhanced for loop—is a control flow statement introduced in Java 5. It’s designed to iterate over elements in arrays and collections without the need for an index variable.

Syntax of For-Each Loop

for (datatype element : collection) {
    // use element
}

Here’s what each part means:

• datatype: the type of the elements (e.g., int, String)
• element: a temporary variable representing the current item in the loop
• collection: an array or iterable collection

Example: Iterating Over an Array

public class ForEachArrayExample {
    public static void main(String[] args) {
        int[] numbers = {10, 20, 30, 40, 50};

        for (int number : numbers) {
            System.out.println("Value: " + number);
        }
    }
}

Value: 10
Value: 20
Value: 30
Value: 40
Value: 50

Why Use For-Each Instead of Traditional For Loop?

Here’s a side-by-side thought:

• With a traditional loop: you control every step of iteration.
• With a for-each loop: Java handles the loop mechanics for you.

It’s clean, readable, and removes the risk of off-by-one errors.

For-Each with Strings

public class ForEachString {
    public static void main(String[] args) {
        String[] fruits = {"Apple", "Banana", "Cherry"};

        for (String fruit : fruits) {
            System.out.println("Fruit: " + fruit);
        }
    }
}

Fruit: Apple
Fruit: Banana
Fruit: Cherry

For-Each with Collections (ArrayList)

import java.util.ArrayList;

public class ForEachCollection {
    public static void main(String[] args) {
        ArrayList colors = new ArrayList<>();
        colors.add("Red");
        colors.add("Green");
        colors.add("Blue");

        for (String color : colors) {
            System.out.println("Color: " + color);
        }
    }
}

Color: Red
Color: Green
Color: Blue

Can I Modify Elements Inside a For-Each Loop?

Good question—and here's a warning. You can’t change the original array or collection items directly inside a for-each loop, at least not for primitives or immutable objects.

int[] values = {1, 2, 3};
for (int value : values) {
    value = value * 2; // This doesn't change the array!
}

// values remain {1, 2, 3}

Why? Because value is a copy of each item, not a direct reference.

For-Each with Nested Arrays (2D Arrays)

public class ForEach2DArray {
    public static void main(String[] args) {
        int[][] matrix = {
            {1, 2},
            {3, 4},
            {5, 6}
        };

        for (int[] row : matrix) {
            for (int val : row) {
                System.out.print(val + " ");
            }
            System.out.println();
        }
    }
}

1 2
3 4
5 6

Limitations of For-Each Loop

While for-each makes code cleaner, it does come with limitations:

• You can’t get the index of the current element.
• You can’t remove items from a collection safely (unless using an Iterator).
• Direct element modification (like updating an array value) is not possible for primitive arrays.

When Should You Use For-Each?

Use it when:

• You need to access every element one by one
• You don’t care about the index
• Your code needs to be clean, readable, and minimal

Conclusion

The for-each loop is your go-to tool for readable, streamlined iteration. It removes distractions so you can focus on what matters: processing data. Whether you're looping over fruit names, colors, or 2D matrices, for-each keeps your intent clear and your code crisp.