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import java.io.*;
import java.util.*;
 
public class PolynomialAddition
{
    static File dataInpt;
    static Scanner inFile;
 
    public static void main(String[] args) throws IOException
    {
      dataInpt=new File("C:\\sentences.txt");
      inFile=new Scanner(dataInpt);
      StringTokenizer myTokens;
      String line, sentence;
      Node parent = new Node();
      while (inFile.hasNextLine())
      {
        Node tempParent = parent;
        line=inFile.nextLine();
        myTokens=new StringTokenizer(line);
        while (myTokens.hasMoreTokens())
        {
          Node current = new Node();
          current.value=myTokens.nextToken();
 
          parent.next=current;
          parent=current;
 
        }
        printList(tempParent.next);
      }
    }
    public static void printList(Node head)
    {
        Node ptr; //not pointing anywhere
        for(ptr=head;ptr!=null;ptr=ptr.next)
          System.out.print(ptr.value + "  ");
        System.out.println();
    }
}

Main.java:4: class PolynomialAddition is public, should be declared in a file named PolynomialAddition.java
public class PolynomialAddition
       ^
Main.java:33: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
    public static void printList(Node head)
                                 ^
Main.java:15: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
      Node parent = new Node();
      ^
Main.java:15: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
      Node parent = new Node();
                        ^
Main.java:18: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
        Node tempParent = parent;
        ^
Main.java:23: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
          Node current = new Node();
          ^
Main.java:23: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
          Node current = new Node();
                             ^
Main.java:35: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
        Node ptr; //not pointing anywhere
        ^
8 errors

Standard output is empty