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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:\\llpoly.txt");
      inFile=new Scanner(dataInpt);
      StringTokenizer myTokens;
      String line,polyTerm;
      Node first=new Node();
      Node firstFull=new Node();
      while (inFile.hasNextLine())
      {
      	line=inFile.nextLine();
        myTokens=new StringTokenizer(line);
        while (myTokens.hasMoreTokens())
        {
	      polyTerm=myTokens.nextToken();
	      first.value=polyTerm.substring(0,polyTerm.indexOf("x"));
		  first.value2=polyTerm.substring(polyTerm.indexOf("^")+1);
		  System.out.print(first.value + "       " + first.value2);
		  if (myTokens.nextToken()!=null)
		  {
		  	polyTerm=myTokens.nextToken();
		  	first.next.value=polyTerm.substring(0,polyTerm.indexOf("x"));
		  	first.next.value2=polyTerm.substring(polyTerm.indexOf("^")+1);
		  }
        }
 
        System.out.println();
      }
 
    }
}

Main.java:3: class PolynomialAddition is public, should be declared in a file named PolynomialAddition.java
public class PolynomialAddition
       ^
Main.java:14: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
      Node first=new Node();
      ^
Main.java:14: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
      Node first=new Node();
                     ^
Main.java:15: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
      Node firstFull=new Node();
      ^
Main.java:15: cannot find symbol
symbol  : class Node
location: class PolynomialAddition
      Node firstFull=new Node();
                         ^
5 errors

Standard output is empty