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public class LinkedList {
    //Instance variable
    private Node top = null;
    private String strLine;
    private Object intNum;

    //Instance and static methods below
    public static LinkedList createLinkedList(String fileName) {

       LinkedList lst = new LinkedList();

       try {
            String str;
            BufferedReader inFile = new BufferedReader(new FileReader(fileName));
            int intNum;
            while ((str = inFile.readLine())!=null) {
                try {
                   intNum = Integer.parseInt(str);
                } catch (NumberFormatException ex) {

       catch (IOException e){
            System.out.println("The file cannnot be opened.");

       return lst;


    public void add(Object data) {
       Node newNode = new Node(data, null);
       addRec(top, newNode);

    private void addRec(Node start, Node newNode) {
       if (start == null) {
            top = newNode;
       } else if (start.getLink() == null)
       else {
            addRec(start.getLink(), newNode);


    public String toString...
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