在java中使用三种方法和for循环查找平均值

时间:2017-07-14 20:18:59

标签: java for-loop methods

package averagewithmethods;

import 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符(&#34;请在一行中最多输入10个数字:&#34;)打印两次

2 个答案:

答案 0 :(得分:2)

getUserInput()

您在此处再次调用calculateAvg()public static void printResults(String userInput, double avgVal) { System.out.println("The average of the numbers " + userInput + " is " + avgVal); } 方法。相反,只需使用您传入的参数变量。

public static void main(String[] args) {
    String userInput = getUserInput();
    double avgVal = calculateAvg(userInput);

    printResults(userInput, avgVal);
}

当然,为了获得您正在寻找的行为,您可能希望在其他方法中稍微改变一下:

String newUserInput[] = userInput.split(" ");

my_hash.select{|k, v| my_selected_keys.include?(k) }.values.min_by(&:last)

答案 1 :(得分:1)

您正在调用getUserInput()方法两次:一次使用printResults()方法,一次使用calculateAvg()

您可能希望进行以下更改:

String newUserInput[] = getUserInput().split(" ");

String newUserInput[] = userInput.split(" ");