package file;

import java.io.File;

import java.util.ArrayList;

public class FileCounter {

    //用于储存找到的每一个文件

    ArrayList<File> fileList;

    //根目录

    File root;

    public FileCounter(String pathName) {

        root = new File(pathName);

        fileList = new ArrayList<>();

    }

    //递归算法查找文件

    public void searchFiles() {

        File[] files = root.listFiles();

        int length = files.length;

        for (int i = 0; i < length; i++) {

            if (files[i].isDirectory()) {

                root = files[i];

                searchFiles();

            } else {

                fileList.add(files[i]);

            }

        }

    }

    //统计文件个数和总的大小

    public void countFiles() {

        long totalSize = 0;

        System.out.println("文件数:" + fileList.size());

        for (int i = 0; i < fileList.size(); i++) {

            totalSize += fileList.get(i).length();//返回由此文件的长度，字节为单位

        }

        System.out.println("文件总大小:" + totalSize);

    }

    //测试

    public static void main(String[] args) {

        String pathName = "E:\\音乐";

        FileCounter counter = new FileCounter(pathName);

        counter.searchFiles();

        counter.countFiles();

    }

}