public void insertFirst(Instruction inst,LinkedList<MethodVariables> mvarList){
  list.addFirst(new VariableMapElement(inst,mvarList));
}

public void insertFirst ( Instruction inst , LinkedList < MethodVariables > mvarList ) { list . addFirst ( new VariableMapElement ( inst , mvarList ) ) ; }
inserts a new entry at the begin of the list .
