我可以得到帮助来计算平均值和总数吗？

Question

我打开了一个文件，打印出来很好，看起来有点像这样；

约翰霍普 13 12.00

劳拉小屋 6 15.00

但是数组是 6。由于我有另一个带有 getter 和 setter 的类，因此该文件能够获取每个人的总工资：

约翰 13 12.00 150.00

劳拉小屋 6 15.00 120.00

我想打印所有个人的总工资，然后得到平均值。 这是我的一些代码

public class PayRoll {

public static void main(String[] args) {
    final int NUMBER_OF_WORKERS = 15;

    final String INPUT_FILE = "data.txt";
    Worker[] worker_ar = new Worker[NUMBER_OF_WORKERS];

    Scanner file = null;

    try {

        file = new Scanner(new File(INPUT_FILE));
    } catch (FileNotFoundException e) {
        System.err.println("File Not Found!");
    }

    String line = null;
    int count = 0;
    double total_pay = 0;
    double avg_pay = 0;

    while ((file.hasNextLine()) && (count < worker_ar.length)) {
        String fName = file.next();
        String lName = file.next();
        int hours = file.nextInt();
        double hrly_pay = file.nextDouble();

        worker_ar[count] = new Worker(fName, lName, hours, hrly_pay);

        count++;
//Here, i tried computing the average but it is wrong. 
        for (int i = 0; i < count; i++)
            total_pay = total_pay + worker_ar[i].computePay();

            avg_pay = total_pay / count;

Answer 1

在计算总数和平均值（或至少是平均值）之前完成文件内容的读取。类似的东西

double total_pay = 0;
while ((file.hasNextLine()) && (count < worker_ar.length)) {
    String fName = file.next();
    String lName = file.next();
    int hours = file.nextInt();
    double hrly_pay = file.nextDouble();
    worker_ar[count] = new Worker(fName, lName, hours, hrly_pay);
    total_pay += worker_ar[count].computePay(); // <-- add this worker's
                                                //     pay to the total.
    count++;
}
double avg_pay = total_pay / count; // <-- calculate the average when 
                                    //     there is a total.