Introduction to Object - Oriented Programming

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• Question.pdf

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import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

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);
                   lst.add(intNum);
                } catch (NumberFormatException ex) {
                   lst.add(str);
                }

            }
       }
       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)
            start.setLink(newNode);
       else {
            addRec(start.getLink(), newNode);
       }

    }

    @Override
    public String toString...