Need this in Java with Eclipse also chegg stop closing my question this entire t

Question

Need this in Java with Eclipse also chegg stop closing my question this entire thing is one question. Answer it this time. I really despise this new system of asking questions.

Using the SinglyLinkedList classes built in class, make the proper modifications to make it a DoublyLinkedList. Then, write a simple text editor. Keep the entire text in a doubly linked list, storing each line in a separate node. The program begins with a line number as a prompt to enter text. From there, you have the following choices:

enter the letter I and a string S: this will insert the string S at the end

enter the letters IA, a line number N, and string S1: inserts S1 after line N

enter the letters IB, a line number N, and string S1: inserts S1 before line N

enter the letter D with a number N: deletes the Nth line of text

enter the letter L with a number N: lists the Nth line of text

enter the letters LA: lists all lines of text

enter the letter Q: quits the program

To support each of these operations, you will have the following methods in your DoublyLinkedList class:

insert: this method will take the line of text as a string and add it to the end of the list.

insertAfter: this method takes an integer parameter (used to indicate a line number) and a string parameter, and inserts the text after the appropriate node.

insertBefore: this method takes an integer parameter (used to indicate a line number) and a string parameter, and inserts the text before the appropriate node

deleteByPosition: this method will take an integer parameter indicating which element should be deleted. For example, if 3 is passed in, the 3rd element should be deleted.

printNode: this method takes an integer parameter of the node to print. For example, if 3 is passed in, it will print the 3rd node.

printAllNodes: this method takes no parameters and prints all nodes in the list.

Included are these

Assign04Driver.java: This should not be modified.

Node.java:This will need to be modified to support a doubly linked list.

DoublyLinkedList.java: A starter class for your doubly linked list. It includes method stubs which you must implement

TextEditor.java: You must not change this interface, nor can you remove the implementation of this interface from DoublyLinkedList.java.

Here is the code I have already for you.

https://www.dropbox.com/s/0710nej3882r86v/DoublyLinkedList.java?dl=0

https://www.dropbox.com/s/pmtqbf4pvryzamz/Assign04Driver.java?dl=0

https://www.dropbox.com/s/0m971tvrkz39pf5/Node.java?dl=0

https://www.dropbox.com/s/c59rr9j4qdhir39/TextEditor.java?dl=0

In the interface and DoublyLinkedList class, there are deleteNodes methods. Do nothing with those

Explanation / Answer

public class DDL
{
    private Node head;
    private int count;
    public DDL()
    {
    head = new Node(null);
    count = 0;
    }
  
    public void insert(Object data)
    {
    Node temp = new Node(data);
    Node current = head;
    while(current.getNext() != null)
    {
        current = current.getNext();
    }
        current.setNext(temp);
        count++;
    }
  
    public void insertAfter(Object data, int index)
    {
    Node temp = new Node(data);
    Node current = head;
    for(int i = 1; i < index && current.getNext() != null; i++)
    {current = current.getNext();}
    temp.setNext(current.getNext());
    current.setNext(temp);
    count++;
    }
  
    public Object insertBefore(int index)
    {
    if(index <= 0)
    return null;
    Node current = head.getNext();
    for(int i = 1; i < index; i++)
    {
    if(current.getNext() == null)
    return null;
    current = current.getNext();
    }
    return current.getData();
    }
  
    public boolean deleteByPosition(int index)
    {
    if(index < 1 || index > size())
    return false;
    Node current = head;
    for(int i = 1; i < index; i++)
    {
    if(current.getNext() == null)
    return false;
    current = current.getNext();
    }
    current.setNext(current.getNext().getNext());
    count--;
    return true;
    }
  
    public String printNode()
    {
    Node current = head.getNext();
    String output = "";
    while(current != null)
    {
    output += "" + current.getData().toString() ;
    current = current.getNext();
    }
    return output;
    }
}

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.