Question

我正在编写代码来读取文本文件，将其转换为LinkedList，然后以相反的顺序写入另一个文本文件。

我面临的问题是，在转换文本文件后，我无法撤消列表。在写作的同时我也面临着问题。这是我的代码，然后是输出......

package Collections;
import java.io.*;
import java.util.*;

public class Store implements Serializable {

    private static final long serialVersionUID = 1L;

    @SuppressWarnings("rawtypes")
    public static void main(String[] args) throws IOException {

        BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
        System.out.print("Enter the File Name:");
        String fname1 = br1.readLine();
        FileInputStream fr1 = null;

        // Reading the file

        try {
            fr1 = new FileInputStream(fname1);
        } catch (FileNotFoundException fe) {
            System.out.println("File Not Found.");
            return;
        }
        BufferedInputStream bin1 = new BufferedInputStream(fr1);
        BufferedReader br = new BufferedReader(new InputStreamReader(bin1));
        LinkedList<String> words = new LinkedList<String>();
        FileOutputStream fout1 = new FileOutputStream("ReverseOrder.txt");
        ObjectOutputStream oos = new ObjectOutputStream(fout1);

        // Converting the file into Linked List

        String theWord;
        while (true) {
            theWord = br.readLine();
            if (theWord != null && theWord.length() > 1)
                words.add(theWord);
            if (theWord == null)
                break;
        }
        String[] data = new String[words.size()];
        for (int i = 0; i < words.size(); i++) {

            data[i] = words.get(i);

        }
        System.out.println("Words:" + words);

        // Reversing the LInkedList... Here I don't know why
        // Collections.reverse(words) isn't working. I coudn't reverse my list

            Collections.reverse(words);

        System.out.println("Words:" + words);

        // Writing into a file....but here it is not printing in reverse order.
        // In fact if I tried to print in Regular order but it's printing with
        // extra characters

        oos.writeObject(words);
        oos.close();
        bin1.close();
    }
}

输出结果为：

Enter the File Name:replace.txt
Words:[Suresh is a good boy and He completed his graduation from IIT Guwahati in 2013 But he is a great man ]
Words:[Suresh is a good boy and He completed his graduation from IIT Guwahati in 2013 But he is a great man ]

文件中打印的输出是：

¬ísrjava.util.LinkedList）S] J`“xpw t eSuresh是一个好孩子，他在2013年从IIT Guwahati完成毕业但是他是一个伟大的人xq~

Answer 1

您正在循环中运行Collections.reverse(words);。您只需要运行一次并跳过循环再次添加自己的单词。而不是：

    for (int i = words.size() - 1; i > 0; i--) {

        words.add(words.get(i));
        Collections.reverse(words);
    }

只运行此：

Collections.reverse(words);

Answer 2

通过LinkedList反转LinkedList迭代，将元素推送到Stack，直到LinkedList的头部为空。然后从堆栈弹出，将每个元素添加回您的linkedList，直到堆栈为空。

Answer 3

这看起来不对：

for (int i = words.size() - 1; i > 0; i--) {
    words.add(words.get(i));
    Collections.reverse(words);
}

你为什么要在循环中这样做？如果Collections.reverse()撤消列表，您只需要

Collections.reverse(words);

你应该完成吗？

如果我在这里遗漏了什么，请告诉我

反向链表并写入文件：Java

3 个答案: