我怎样才能从ArrayList中重复值？ [英] How can I get duplicated values from ArrayList?

问题描述

还有就是我的code：

There is my code:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;


public class CompareFile {

    CompareFile() {}

    boolean check = false;
    int count = 0;

    /*
     * this method return a File type variable
     * variable path - this parameter takes a path in specified root
     * also it's a private method and he should be called with help by class object
     */
    public File find(File path) throws FileNotFoundException {
        PrintWriter writer = new PrintWriter("D:/Photos/name.txt");

        ArrayList<String> buffer = new ArrayList<String>();

        /*
         * let's create array of files
         * where must be all found files
         * We use File[], and named 'files'
         * variable files takes on list of found files
         * with help by listFiles method, that
         * return list of files and directories
         */
        File[] files = path.listFiles();
        //System.out.println(files.toString());

        try {       
            /*
             * we'll ought use the for each loop
             * in this loop we'll create File type variable 'file'
             * then we'll do iterating for each expression from variable files
             */
            for (File file : files) {
                //print all found files and directories

               //if file or directory exists
                if (file.isDirectory()) {

                    //recursively return file and directory
                    find(file);
                } 
                else {
                        buffer.add(file.getName());
                            System.out.println(file);
                }
            }
        }
        catch (Exception e)  {
            System.out.print("Error");
        }
        finally{
            if ( writer != null ) 
                writer.close();
        }


       /*
            Iterator<String> i = buffer.iterator();
                while(i.hasNext()) {
                    System.out.println(i.next());
                }*/

        return path;
    }

    public static void main(String[] args) throws FileNotFoundException  {
        File mainFile = new File("D:/Photos/");

        CompareFile main = new CompareFile();
        main.find(mainFile);
    }
}

如果我使用排序，排序，结果不好，因为第一排从目录照片之后，
从目录目录第二排照片/子让我们来看看
屏幕：我想你懂的）

If I use sort, after sorting, the result bad, because first row from dir "Photos", and second row from directory in directory "Photos/sub" Let's look at the screen: I think you understand)

http://s10.postimg.org/7hcw83z9x/image.png

推荐答案

您将需要跟踪你在树枝上的，更改找到方法采取的路径：

You'll need to keep track of where you are in the tree, change the find method to take a path:

公开文件中找到（文件路径，路径字符串=）抛出FileNotFoundException异常

在递归调用find方法：
查找（文件，路径+ file.getName（）+/）

When you call the find method recursively: find(file, path + file.getName() + "/")

然后，当您添加到列表中，使用
buffer.add（路径+ file.getName（））;

Then when you add to the list, use buffer.add(path + file.getName());

这篇关于我怎样才能从ArrayList中重复值？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！