Question

Please help me fix my errors. I would like to read and write the text file in java. my function part do not have errors. below is my code

import java.io.FileInputStream;

import java.io.InputStreamReader;

import java.io.FileWriter;

import java.io.IOException;

public class LinkedList

{

   Node head;

   class Node

   {

       int data;

       Node next;

      Node(int d)

       {

           data = d;

           next = null;

       }

   }

   void printMiddle()

   {

       Node slow_ptr = head;

       Node fast_ptr = head;

       if (head != null)

       {

           while (fast_ptr != null && fast_ptr.next != null)

           {

               fast_ptr = fast_ptr.next.next;

               slow_ptr = slow_ptr.next;

           }

           System.out.println("The middle element is [" +

                               slow_ptr.data + "] \n");

       }

   }

   public void push(int new_data)

   {

       Node new_node = new Node(new_data);

       new_node.next = head;

       head = new_node;

   }

   public void printList()

   {

       Node tnode = head;

       while (tnode != null)

       {

           System.out.print(tnode.data+"->");

           tnode = tnode.next;

       }

       System.out.println("NULL");

   }

   public class TextFileReadingAndWriting {

    public static void main(String[] args) {

        try {

            FileReader reader = new FileReader("MyFile.txt");

try {

            FileWriter writer = new FileWriter("MyFile.txt", true);

            BufferedReader bufferedReader = new BufferedReader(reader);

            String line;

            while ((line = bufferedReader.readLine()) != null) {

                System.out.println(line);

            }

            reader.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

this is string list in a text file which I like to read:

Hishaam Esteban Kevin

Matthew    Brandon

Joel Luis     Jianwei Yechiel

Taeyong

Jiayu

Jiade Phillip

Russell         Mohebullah

Akshar   Evgeniia       Andres   Marco Justin

Robin Kelvin Zhiheng Jeffrey

Yifei Yinyu

Jiaxin Youyia Eleftherios

Yuan

Answer 1

CODE

import java.io.*;

class LinkedList {

    Node head;

    class Node {

        int data;

        Node next;

        Node(int d) {

            data = d;

            next = null;

        }

    }

    void printMiddle() {

        Node slow_ptr = head;

        Node fast_ptr = head;

        if (head != null) {

            while (fast_ptr != null && fast_ptr.next != null) {

                fast_ptr = fast_ptr.next.next;

                slow_ptr = slow_ptr.next;

            }

            System.out.println("The middle element is [" +

                    slow_ptr.data + "] \n");

        }

    }

    public void push(int new_data) {

        Node new_node = new Node(new_data);

        new_node.next = head;

        head = new_node;

    }

    public void printList() {

        Node tnode = head;

        while (tnode != null) {

            System.out.print(tnode.data + "->");

            tnode = tnode.next;

        }

        System.out.println("NULL");

    }
}

public class TextFileReadingAndWriting {

    public static void main(String[] args) {

        try {

            FileReader reader = new FileReader("MyFile.txt");

            try {

                FileWriter writer = new FileWriter("MyFile.txt", true);

                BufferedReader bufferedReader = new BufferedReader(reader);

                String line;

                while ((line = bufferedReader.readLine()) != null) {

                    System.out.println(line);

                }

                reader.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

    }
}

OUTPUT