Java

Arrays

An array holds a fixed number of values of one type: int[] numbers = {1, 2, 3, 4, 5};.

Example: an enhanced for-loop over an array

public class Main {
    public static void main(String[] args) {
        int[] numbers = {1, 2, 3, 4, 5};
        int total = 0;
        for (int n : numbers) {
            total += n;
        }
        System.out.println("Total: " + total);
    }
}

Total: 15

for (int n : numbers), read "for each int n in numbers", is Java's enhanced for-loop, and is generally preferred over a manual index-based loop whenever you don't actually need the index itself, just each value in turn. Access individual items by zero-based index (numbers[0]), and get the length with numbers.length, a field, not a method, so no parentheses.

public class Main {
    public static void main(String[] args) {
        int[] numbers = {1, 2, 3, 4, 5};
        int total = 0;
        for (int n : numbers) {
            total += n;
        }
        System.out.println("Total: " + total);
    }
}

Total: 15

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