java - 在循环中将所有 double 相加，Java

Question

因此，我必须创建这个程序，从文件中读取多个“工资”，然后将所有工资相加以返回一个“总工资”，并计算所有工资的平均值。

我目前拥有的代码如下:

package uploadTask7_countingSalaries;

//import utilities needed for the program
import java.util.Scanner;
import java.io.File;

public class countingSalaries {

    public static void main(String[] args) throws Exception { 
        // defines the file that data will be read from
        File salaryFile = new File("salaries.txt");
        // creates scanner object to read data from file
        Scanner scanFile = new Scanner (salaryFile);
        // creates while loop to read and print data to the user
        while(scanFile.hasNextDouble()) {
            double i = scanFile.nextDouble();
            System.out.println(i); }

        double addedSalary = scanFile.nextDouble();
        double sumofSalary = 0.0;
        while(scanFile.hasNextDouble()) {
            sumofSalary += addedSalary;
            addedSalary++; }

        System.out.println("Total salary is: " + addedSalary);

        }
    }

到目前为止，我已经能够从文本文件中读取工资并将其打印给用户。我正在努力寻找一种方法来使用循环将所有数字相加/计算外部文件的平均值。

Answer 1

我会这样做。看来您正在尝试迭代两次而不重置迭代器。

package uploadTask7_countingSalaries;

//import utilities needed for the program
import java.util.Scanner;
import java.io.File;

public class countingSalaries {

    public static void main(String[] args) throws Exception { 
        List<Double> salaries = new ArrayList<Double>();
        // defines the file that data will be read from
        File salaryFile = new File("salaries.txt");
        // creates scanner object to read data from file
        Scanner scanFile = new Scanner (salaryFile);
        // creates while loop to read and print data to the user
        while(scanFile.hasNextDouble()) {
            double i = scanFile.nextDouble();
            salaries.add(i);
            System.out.println(i); }

       double total = 0;
       for(double a : salaries){
        total = total + a;
       }

        System.out.println("Total salary is: " + total);
        System.out.println("Avg = " + total/salaries.size();

        }
    }