Iterate over an Array using Java 8 Stream and foreach

In this Java 8 example, we will take a look at how to iterate over an Array using Java 8 Stream and foreach method,

1 |    public static void main(String[] args) {
2 |        int[] numbers = {1,2,3,4,5,6};
3 |        Arrays.stream(numbers).forEach(System.out::println);
4 |    }

1
2
3
4
5
6

As you see int array at the line number 2 and on line 3 we convert this array to stream using Arrays.stream(int[] arr) method and then use foreach over it and print the values out using System.out::println

    public static void main(String[] args) {
        String[] languages = {"Java","Python","Php","C#","Go"};
        Arrays.stream(languages).forEach(System.out::println);
    }

Java
Python
Php
C#
Go

    public static void main(String[] args) {
        double[] prices = {19.99, 29.99, 9.99, 49.99};
        Arrays.stream(prices).forEach(price -> System.out.printf("$%.2f%n", price));
    }

$19.99
$29.99
$9.99
$49.99

In this example, we have a double array of prices. We use Arrays.stream(double[] arr) to convert the array to a stream and then format the output using System.out.printf to display the prices in a currency format.

    public static void main(String[] args) {
        List fruits = Arrays.asList("Sunday", "Monday", "Tuesday", "Friday");
        fruits.stream().forEach(fruit -> System.out.println("Day: " + fruit));
    }

Day: Sunday
Day: Monday
Day: Tuesday
Day: Friday

Here, we have a List of days of week. We convert the list to a stream and use foreach to print each fruit with a prefix.