Application of linkedlist

Polynomial Addition
import java.io.*;
class node
{
       int coe,exp;
       public node next;
       public node(int id,int dd)
         {
              coe=id;
              exp=dd;
         }
public void displaynode()
      {
         System.out.print(coe +"x^" +exp );
      }
}
class nodeList
{
   public node first;
   public node last;
   public void nodeLIst()
    {
      first=null;
      last=null;
    }
   public boolean isEmpty()
    {
      return(first==null);
    }
  public void insert(int id,int dd)
   {
    if(isEmpty())
     {
      first=new node(id,dd);
      last=first;
     }
   else
    {
      last.next=new node(id,dd);
      last=last.next;
    }
  }
public void displayList()
  {
   node current=first;
   while(current!=null)
    {
      current.displaynode();
      if(current.next!=null)
      System.out.print(" + ");
      current=current.next;
    }
}
public void read() throws Exception
  {
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    int c,e,h=1;
    while(h==1)
     {
     System.out.println("Enter coefficient\n");
        c=Integer.parseInt(br.readLine());
        System.out.println("Enter exponent\n");
        e=Integer.parseInt(br.readLine());
        insert(c,e);
     System.out.println("1.Enter add more terms\n 0:Exit");
        h=Integer.parseInt(br.readLine());
        }
     }
public void add(nodeList x,nodeList y,nodeList z) throws Exception
  {
    node p=x.first;
    node q=y.first;
    while(p!=null&&q!=null)
     {
      if(p.exp==q.exp)
       {
         z.insert(p.coe+q.coe,p.exp);
     p=p.next;
     q=q.next;
       }
      else
       if(p.exp>q.exp)
        {
         z.insert(p.coe,p.exp);
         p=p.next;
        }
      else
        {
         z.insert(q.coe,q.exp);
         q=q.next;
        }
     }
   while(p!=null)
   {
     z.insert(p.coe,p.exp);
     p=p.next;
    }
  while(q!=null)
   {
     z.insert(q.coe,q.exp);
     q=q.next;
    }
}
}
class polynomial2
{
  public static void main(String arg[])throws Exception
  {
   int id;
   int dd;
   BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
   nodeList obj1=new nodeList();
   System.out.println("\nEnter the first polynomial");
   obj1.read();
   nodeList obj2=new nodeList();
   System.out.println("\nEnter the second polynomial");
   obj2.read();
   System.out.print("\nThe polynomial are\np(x) =");
   obj1.displayList();
   System.out.print("\nq(x)  =");
   obj2.displayList();
   System.out.print("\np(x)+q(x)  =");
   nodeList obj3=new nodeList();
   obj3.add(obj1,obj2,obj3);
   obj3.displayList();
}
}

 
            
         
  
 Java