find-mean-array()

Step 1: Declare and Initialize the Array

The first step is to declare and initialize the array of numbers. In our case, we are going to initialize an array of integers in our main method.

Let's declare and initialize our array with the following values: {4, 5, 1, 2, 3}

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

Step 2: Create CalculateSum Method

Next, we need to create a method calculateSum that will take our integer array as an argument and return the sum of all the elements.

public static int calculateSum(int[] numbers) {
    int sum = 0;
    for(int number : numbers) {
        sum += number;
    }
    return sum;
}

Step 3: Calculate Mean

The mean of a set of numbers is the sum of the numbers divided by the number of elements. To calculate the mean, call the calculateSum method, passing the numbers array as the argument. Then divide the sum by the length of the array.

public static double calculateMean(int[] numbers) {
    int sum = calculateSum(numbers);
    return (double) sum / numbers.length;
}

Step 4: Call Function in Main Method

We need to call our calculateMean function in our main method. The result will be printed to the console.

public static void main(String[] args) {
    int[] numbers = {4, 5, 1, 2, 3};
    double mean = calculateMean(numbers);
    System.out.println("The mean is : " + mean);
}

Conclusion

You now know how to calculate the mean of an array of integers in Java. The complete code snippet for this is:

public class Main {
    public static void main(String[] args) {
        int[] numbers = {4, 5, 1, 2, 3};
        double mean = calculateMean(numbers);
        System.out.println("The mean is : " + mean);
    }

    public static double calculateMean(int[] numbers) {
        int sum = calculateSum(numbers);
        return (double) sum / numbers.length;
    }

    public static int calculateSum(int[] numbers) {
        int sum = 0;
        for(int number : numbers) {
            sum += number;
        }
        return sum;
    }
}

This will output: The mean is : 3.0