Java：从 txt 文件计算平均值时出现问题

Question

大家好先post就到这里了！我目前在使用 readfromfile() 计算平均值时遇到一些问题我的问题是它打印了十个数字 "stuck together" 像 12345678910 我不明白我怎么能像这样计算平均值我试过 token/10 并且它 returns 0000000000

有什么建议可以从这个烂摊子中取平均值吗？

我尝试用 %n%s 返回令牌，这看起来更好，但是当我除以 10 时它仍然没有给我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();

        }
    }

    //required to close file for write
    public static void closeFile() {
        output.close();
    }

    //required to close file for read
    public static void closeFileRead() {
        input.close();
    }
}

Answer 1

只需将您的 readFromFile 方法更改为：-

public static void readFromFile() {
        double average = 0;
        while (input.hasNextInt()) {
            int token = input.nextInt();
            average+=token;
        }
        System.out.println("Average ="+average/10);
}

Java：从 txt 文件计算平均值时出现问题

Java: issue calculating average from txt file

java

average

read-write