java - 无法用我的文件程序计算目录的总大小

Question

我对上面刚刚提到的内容有一点问题。

供您参考，这是我的这个程序的代码：

import java.io.*;
import java.util.*;

public class DirectorySizeProcessor extends DirectoryProcessor
{
    /*
    Dan Czarnecki
    October 17, 2013

    Class variables:
        private Vector<Long> directorySizeList
            Variable of type Vector<Long> that holds the total file size of files in that directory
            as well as files within folders of that directory

        private Vector<File> currentFile
            Variable of type Vector<File> that

    Modification History
        October 17, 2013
            Original version of class
            Implemented run() and processFile() methods
    */

    private Vector<Long> directorySizeList;
    private Vector<File> currentFile;

    public DirectorySizeProcessor(File startingDirectory) throws FileNotFoundException
    {
        super(startingDirectory);
        directorySizeList = new Vector<Long>();
        currentFile = new Vector<File>();
    }

/*
    public void run()
    {
        File file;
        file = directoryLister.next();
        while(file != null) //the following will be called when the File object is not null
        {
            processFile(file);
            file = directoryLister.next();
        }
    }
*/


    public void processFile(File file)
    {
        Long hold;
        Long currentSize;
        Long finalTotal;
        int index;
        File parentFile;

        parentFile = file.getParentFile();
        index = this.currentFile.indexOf(parentFile);

        if(index < 0)
        {
            this.directorySizeList.addElement((long)0);
            this.currentFile.addElement(file.getParentFile());
        }
        while(index > 0)
        {
            currentSize = this.directorySizeList.get(index);
            hold = file.length();
            finalTotal = hold + currentSize;
            //System.out.println("current size: " + parentFile);
            //System.out.println("current size: " + currentSize);
            System.out.println("file: " + file);
            System.out.println("current size: " + file.length());
            parentFile = parentFile.getParentFile();
            index = this.getParentDirectory().indexOf(parentFile);
            finalTotal = file.length() + finalTotal;
            System.out.println("final total: " + finalTotal);
        }

    }

    public void run()
    {
        File file;
        file = directoryLister.next();


        while(file != null) //the following will be called when the File object is not null
        {
            processFile(file);
            file = directoryLister.next();
        }

    }

    public Vector getParentDirectory()
    {
        return this.currentFile;
    }

    public Vector getDirectorySizeList()
    {
        return this.directorySizeList;
    }


}

我知道问题主要出在我的 processFile() 方法中。当我从我的 Driver 类运行它时（通过 run() 方法，它确实在其中调用 processFile() 方法），它正确显示了每个单独文件的大小（以字节为单位），但我认为它不是在计算整个目录的大小，因为它与属性窗口中显示的大小不匹配。有人可以帮我吗？

Answer 1

我认为您在向向量添加新目录/大小后忘记设置索引，这可能会导致它始终跳过任何目录的第一个文件。

    ...
    index = this.currentFile.indexOf(parentFile);

    if(index < 0)
    {
        this.directorySizeList.addElement((long)0);
        this.currentFile.addElement(file.getParentFile());
        // set the index again to make it enter the while loop
        index = this.currentFile.indexOf(parentFile);
    }
    while(index > 0)
    {
    ...