Java：从txt文件计算平均值的问题

Question

大家好，第一个帖子在这里！我目前有一些问题与我的readfromfile（）计算平均值我的问题是它打印十个数字“粘在一起”像12345678910我不明白我如何计算这样的平均值，我尝试了token / 10，它返回0000000000

任何建议从这个混乱中获得平均值？

我尝试返回带有%n%s的令牌，这看起来更好，但是当我除以10时，它仍然没有给我一个正确的数字，我做错了什么

package average;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.nio.file.Paths;

import java.util.Formatter;

import java.util.InputMismatchException;

import java.util.Scanner;

public class average {

    private static Formatter output;

    private static Scanner input;

    public static void main(String[] args) {

        openFileWrite();

        writeToFile();

        closeFile();

        openFileRead();

        readFromFile();

        closeFileRead();

    }

    public static void openFileRead() {      // gets file for "read"

        try {

            input = new Scanner(Paths.get("Numbers.txt"));

        } catch (IOException e) {

            System.out.println("Unable to read file");

        }

    }

    public static void openFileWrite() {     // gets file for "write"

        try {

            output = new Formatter("Numbers.txt");

        } catch (FileNotFoundException e) {

            System.out.println("Unable to open file");

        }

    }

    public static void readFromFile() {

        while (input.hasNextInt()) {

            int token = input.nextInt();

            System.out.print(token);

        }

    }

    public static void writeToFile() {

        Scanner input = new Scanner(System.in);

        System.out.println("Enter 10 numbers");

        try {

            for (int i = 0; i < 10; i++) {

                System.out.println("Another Number Please");

                int total = input.nextInt();

                output.format("%s%n", total);

            }

        } catch (InputMismatchException e) {

            System.out.println("Please do not enter any letters");

            writeToFile();

        }

    }

Answer 1

只需将你的 readFromFile 方法更改为：-public static void readFromFile() {&nbsp; &nbsp; &nbsp; &nbsp; double average = 0;&nbsp; &nbsp; &nbsp; &nbsp; while (input.hasNextInt()) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int token = input.nextInt();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; average+=token;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; System.out.println("Average ="+average/10);}