如何用程序拆解文本中的数值并计算

import java.io.BufferedReader;

import java.io.IOException;

import java.io.FileReader;

import javax.swing.JFileChooser;

import javax.swing.JOptionPane;

import java.util.ArrayList;

public class Week04 {

    public static void   main(String[] args) throws IOException {

        String theFile;

        theFile =   getTheFileName();

        double theAverage;

        theAverage =   getTheAverage(theFile);

          displayTheResult(theAverage,"The average is;");

    }

    public static String   getTheFileName() {

        String theFile;

        JFileChooser jfc = new   JFileChooser();

          jfc.showOpenDialog(null);

        return theFile =   jfc.getSelectedFile().getAbsolutePath();

    }

    public static double   getTheAverage(String s) throws IOException {

        double value = 0,   numValues = 0;

        FileReader fr = new   FileReader(s);

        BufferedReader br = new   BufferedReader(fr);

        String aLine;

        while ((aLine =   br.readLine()) != null) {

             String nums[] = aLine.split(" ");

             For   (int i=0;i<nums.length;i++){

                value +=   Double.parseDouble(nums[i]);     

                numValues++;

             }

        }

        if (numValues > 1) {

            return   value/numValues;

        } else {

            return value;

        }

    }

    public static void   displayTheResult(double x, String s){

              JOptionPane.showMessageDialog(null,s + x);

    }

}