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Loop Through an Array in Java

Looping through an array allows you to access or modify each element systematically. You can use different types of loops to iterate over arrays.

Key Topics

1. Using a For Loop

The traditional for loop gives you access to the index of each element.

int[] numbers = {10, 20, 30, 40, 50};
for (int i = 0; i < numbers.length; i++) {
    System.out.println("Element at index " + i + ": " + numbers[i]);
}

2. Using a For-Each Loop

The enhanced for loop simplifies iteration when you don't need the index.

int[] numbers = {10, 20, 30, 40, 50};
for (int number : numbers) {
    System.out.println("Number: " + number);
}

3. Modifying Array Elements

You can modify elements during iteration using the index.

String[] fruits = {"Apple", "Banana", "Cherry"};
for (int i = 0; i < fruits.length; i++) {
    fruits[i] = fruits[i].toUpperCase();
}

Key Takeaways

  • Use loops to iterate over array elements.
  • The traditional for loop is useful when you need the index.
  • The for-each loop is more concise when you only need the value.
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