I have to implement a one linked list but it should put object in appropriate position. Everything was OK when I use it in conjunction with specific class, but when I tried make it universal and argument of method insert was Object some problem appeared. When I want to input Object in right position I should use CompareTo method, but there isn't method in Object class! The problem is how to compare two object elements without known about their real types. Maybe I should use generic class type? But what about CompareTo? Or maybe combine with Element class and place CompareTo there? I suppose it is feasible. :)

public void insert(Object o)
{
   Element el = new Element(o);
   //  initializing and setting iterators

   while(!it.isDone() && ((it.current().getValue())).CompareTo(o)<0) 
                         // it.current() returns Element of List
   {    
      //move interators
   }
//...
}