[Java] How to compute average of all elements from an array?

In Java, simplest way of doing average of all elements from an array is using streams.
Following code does that

import java.util.Arrays;

public class JavaArrays {
	public static void main(String[] args) {
		int[] numbers = { 22, 456, 97, 4 };
		System.out.println("Average of all numbers from the array: " + Arrays.stream(numbers).average());
	}
}

Note: the average method returns java.util.OptionalDouble. If you want a double you can do the following

import java.util.Arrays;

public class JavaArrays {
	public static void main(String[] args) {
		int[] numbers = { 22, 456, 97, 4 };
		System.out.println("Average of all numbers from the array: " +  Arrays.stream(numbers).average().getAsDouble());
	}
}

This will throw exception if the array is empty. so you need to handle the following

Exception in thread "main" java.util.NoSuchElementException: No value present
	at java.base/java.util.OptionalDouble.getAsDouble(OptionalDouble.java:130)
	at JavaArrays.main(JavaArrays.java:6)

Try online here: https://onecompiler.com/java/3xmstx7jd