Package 平均方法；
导入java.util.scanner；

public class AverageWithMethods {

    public static void main(String[] args) {
        String userInput = "";
        double avgVal = 0;
        //calculateAvg(userInput);
        //getUserInput();
        printResults(userInput, avgVal);
    }

    public static String getUserInput() {
        String userInput;
        Scanner scnr = new Scanner(System.in);
        System.out.print("Please enter up to ten numbers in one line: ");
        userInput = scnr.nextLine();
        return userInput;
    }

    public static double calculateAvg(String userInput) {
        double avgVal = 0;
        double totSum = 0;
        int i;
        String newUserInput[] = getUserInput().split(" ");
        double[] userInputArray = new double[newUserInput.length];

        for (i = 0; i < newUserInput.length; ++i) {
            String userInputString = newUserInput[i];
            userInputArray[i] = Double.parseDouble(userInputString);
            totSum +=userInputArray[i];
            avgVal = totSum/newUserInput.length;
        }
        return avgVal;
    }

    public static void printResults(String userInput, double avgVal) {
        System.out.println("The average of the numbers " + getUserInput() + " is " + calculateAvg(userInput));
    }
}

这是我的输出。

Please enter up to ten numbers in one line: 10 20 30
Please enter up to ten numbers in one line: 10 20 30
The average of the numbers 10 20 30 is 20.0
BUILD SUCCESSFUL (total time: 6 seconds)

我唯一需要知道的是，为什么提示（“请在一行中最多输入十个数字：”）会打印两次