需要帮助的高中生；将输出写入文件（使用移动距离程序）？

Question

任何人都可以帮我解决下面的代码吗？我已经为此工作了几个小时，无论我做什么，似乎都无法将输出写入文件。我是一名高中生，向我的老师求助，但她发给我的东西没有帮助，我现在完全不知所措。我自己独立学习这门课程，所以希望 Whosebug 家族的人能给我一些指导？这不是因为我缺乏尝试。我只是不知所措。提前致谢！！

/**
 * 
 */
package distanceTraveledReport;
import java.util.Scanner;
import java.io.*;

/**
 * @author Jerin
 *
 */
public class DistanceTraveledReport {
    
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
        //prints out name and project I am working on
        System.out.println("Jerin Anderson, This is my Distance Traveled Report");
                
        //create scanner
        Scanner scanner = new Scanner(System.in);
        double vehicleSpeed = -1; //to hold the speed from the vehicle
        int hoursTraveled = 0; //to hold the hours traveled by the vehicle
        double distanceTraveled; //to hold the distance traveled for each hour
                
        //while loop, inputs validation
        while ( vehicleSpeed < 0 ) 
                {
                    System.out.println("Enter the speed of the vehicle (in miles-per-hour)" );
                    vehicleSpeed = scanner.nextDouble();
                }
        while (hoursTraveled < 1) 
                {
                    System.out.println("Enter the number of hours traveled by the vehicle" );
                    hoursTraveled = scanner.nextInt();
                }
                
        //heading at the top and lines to separate table
        System.out.println(" Hour\t Distance Traveled");
        System.out.println("---------------------------");
        
                {
        //write the table of distances
        distanceTraveled = 1;
        while (distanceTraveled <= hoursTraveled)
        {
            //Display the distance for this period.
            System.out.println(distanceTraveled + "\t\t" + distanceTraveled * vehicleSpeed);
            
            //Increment period
            distanceTraveled++;
        }
        
        //Close the file.
        System.out.close();
        System.out.println("Report written to DistanceReport.txt");
    }

}
    
}

Answer 1

您必须意识到 System.out.println() 不会写入文件，但 FileWriter 会 。对代码的修复以 //TODO.

突出显示

package distanceTraveledReport;

import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

/**
     * @author Jerin
     *
     */
    public class DistanceTraveledReport {

        /**
         * @param args
         */
        public static void main(String[] args) throws IOException {
            // TODO "TODO check this out" marks addition of FileWriter fileWriter.
            //TODO check this out
            //TODO make sure you change the filename

首先打开.txt文件的路径，因为当前路径不是你的文件路径（见“cole.henrich/Downloads...”）

然后复制绝对路径：

然后粘贴到FileWriter的参数中： .

代码继续：

FileWriter fileWriter = new FileWriter("/Users/cole.henrich/Downloads/Whosebug/src/distanceTraveledReport/DistanceReport.txt");
            fileWriter.write("The FileWriter writes to the file. System.out.println() does not.\n");

            //prints out name and project I am working on
            System.out.println("Jerin Anderson, This is my Distance Traveled Report");

            //create scanner
            Scanner scanner = new Scanner(System.in);
            double vehicleSpeed = -1; //to hold the speed from the vehicle
            int hoursTraveled = 0; //to hold the hours traveled by the vehicle
            double distanceTraveled; //to hold the distance traveled for each hour

            //while loop, inputs validation
            while ( vehicleSpeed < 0 )
            {
                System.out.println("Enter the speed of the vehicle (in miles-per-hour)" );
                vehicleSpeed = scanner.nextDouble();
            }
            while (hoursTraveled < 1)
            {
                System.out.println("Enter the number of hours traveled by the vehicle" );
                hoursTraveled = scanner.nextInt();
            }

            //heading at the top and lines to separate table
            System.out.println(" Hour\t Distance Traveled");
            System.out.println("---------------------------");

            {
                //write the table of distances
                distanceTraveled = 1;
                while (distanceTraveled <= hoursTraveled)
                {
                    //Display the distance for this period.
                    String display = ""+ (distanceTraveled + "\t\t" + distanceTraveled * vehicleSpeed) + "\n";
                    System.out.println(display);
                    //TODO check this out
                    fileWriter.write(display);
                    //Increment period
                    distanceTraveled++;
                }

                //Close the file.
                //TODO check this out
                fileWriter.close();
                //TODO check this out: DO NOT close the System.out. Close FileWriter fileWriter.
                System.out.println("Report written to DistanceReport.txt");
            }

        }

    }

确保您了解 FileWriter。阅读评论中的链接。这是文件中的输出（不是 System.out）。

The FileWriter writes to the file. System.out.println() does not.
    1.0     65.0
    2.0     130.0
    3.0     195.0
    4.0     260.0
    5.0     325.0
    6.0     390.0
    7.0     455.0

需要帮助的高中生；将输出写入文件（使用移动距离程序）？

Highschool needing help please; writing output to a file (using the distance traveled program)?

java

file

output

report