Scanner sc = new Scanner(System.in);

System.out.println("Please type some words, then press enter: ");

int count = 0;
double sum = 0;

String input = sc.nextLine();

String[] words = input.split("\\s+"); // split by whitespace

// iterate over each word and update the stats
for (String word : words) {
    double wordLength = word.length();
    sum += wordLength;
    count++;
}

// calculate the average at the end
double average = 0;
if (count > 0) {
    average = sum / count;
}

System.out.println("Average word length = " + average);