Exercise 3 (List ADT – Removing Last Half) In the Lab7project, Modify the LinkedIntListclass to include a new method called removeLastHalf, which removes the last half of elements in the list. For example, if the list contains 2, 4, 7, 6, 5, 9, with 2 being at the front, then the method would modify the list so it contains only 2, 4, 7. Test your implementation in the main method. Also, state the time complexity of your method implementation.
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- Import the ArrayList and List classes from the java.util package to create a list of phone numbers and also import the HashSet and Set classes from the java.util package to create a set of unique prefixes. Create a class called PhoneNumberPrefix with a main method that will contain the code to find the unique prefixes. Create a List called phoneNumbers and use the add method to add several phone numbers to the list. List<String> phoneNumbers = new ArrayList<>(); phoneNumbers.add("555-555-1234"); phoneNumbers.add("555-555-2345"); phoneNumbers.add("555-555-3456"); phoneNumbers.add("444-444-1234"); phoneNumbers.add("333-333-1234"); Create a Set called prefixes and use a for-each loop to iterate over the phoneNumbers list. For each phone number, we use the substring method to extract the first 7 characters, which represent the prefix, and add it to the prefixes set using the add method. Finally, use the println method to print the prefixes set, which will contain all of…You may find a doubly-linked list implementation below. Our first class is Node which we can make a new node with a given element. Its constructor also includes previous node reference prev and next node reference next. We have another class called DoublyLinkedList which has start_node attribute in its constructor as well as the methods such as: 1. insert_to_empty_list() 2. insert_to_end() 3. insert_at_index() Hints: Make a node object for the new element. Check if the index >= 0.If index is 0, make new node as head; else, make a temp node and iterate to the node previous to the index.If the previous node is not null, adjust the prev and next references. Print a message when the previous node is null. 4. delete_at_start() 5. delete_at_end() . 6. display() the task is to implement these 3 methods: insert_at_index(), delete_at_end(), display(). hint on how to start thee code # Initialize the Node class Node: def __init__(self, data): self.item = data…please follow instructions correctly. You are required to complete the LinkedList class. This class is used as a linked list that has many methods to perform operations on the linked list. To create a linked list, create an object of this class and use the addFirst or addLast or add(must be completed) to add nodes to this linked list. Your job is to complete the empty methods. For every method you have to complete, you are provided with a header, Do not modify those headers(method name, return type or parameters). You have to complete the body of the method. package chapter02; public class LinkedList { protected LLNode list; public LinkedList() { list = null; } public void addFirst(T info) { LLNode node = new LLNode(info); node.setLink(list); list = node; } public void addLast(T info) { LLNode curr = list; LLNode newNode = new LLNode(info); if(curr == null) { list = newNode; } else…
- You are required to complete the LinkedList class. This class is used as a linked list that has many methods to perform operations on the linked list. To create a linked list, create an object of this class and use the addFirst or addLast or add(must be completed) to add nodes to this linked list(I created one linked list in TestLinkedList). I've already created the class for you and have some completed method in there, your job is to complete the empty methods. For every method you have to complete, you are provided with a header, Do not modify those headers(method name, return type or parameters). You have to complete the body of the method. public void add(T after This, T info) The parameter info will be the information the new node should contain, and the new node will be added after the node that contains the parameter after This as an information. public void removeFirst() Removes the first node in the linked list. Hint: be aware of empty lists. public void removeLast() Removes…Write a method for the Linked Based List class which returns the largest item in the list. If the list is empty return null. Assume that class T is Comparable.DO NOT USE ANY OTHER METHODS OF THE LINKED BASED LIST CLASS. What is the worst case and best case complexity of the code in the previous problem? Explain your answer.Write a method replace to be included in the class KWLinkedList (for doubly linked list) that accepts two parameters, searchItem and repItem of type E. The method searches for searchItem in the doubly linked list, if found then replace it with repItem and return true. If the searchItem is not found in the doubly linked list, then insert repItem at the end of the linked list and return false. Assume that the list is not empty. You can use ListIterator and its methods to search the searchItem in the list and replace it with repItem if found. Do not call any method of class KWLinkedList to add a new node at the end of the list. Method Heading: public boolean replace(E searchItem, E repItem) Example: searchItem: 15 repItem: 17 List (before method call): 9 10 15 20 4 5 6 List (after method call) : 9 10 17 20 4 5 6
- You are required to complete the LinkedList class. This class is used as a linked list that has many methods to perform operations on the linked list. To create a linked list, create an object of this class and use the addFirst or addLast or add (must be completed) to add nodes to this linked list(I created one linked list in TestLinkedList). I’ve already created the class for you and have some completed method in there, your job is to complete the empty methods.For every method you have to complete, you are provided with a header, Do not modify those headers( method name, return type or parameters). You have to complete the body of the method. public void add(T afterThis, T info) The parameter info will be the information the new node should contain, and the new node will be added after the node that contains the parameter afterThis as an information public void removeFirst() Removes the first node in the linked list. Hint: be aware of empty lists. public void removeLast() Removes…The curly bracket used in java to enclose units of code can not be used in a fill in questions. For this questions the curly brackets will be substituted with comments. Interpret the begin and end comments as curly brackets. Complete the code for the method filter. The method receives two parameter of generic type E called low and high. The method filters the elements within the linked list and return a linked list with all the elements from the low value to the high value. Example: [1,2,4,5,8,9,11,12] Called with low = 2 and high =10 will return [2,4,5,8,91. public //begin method MyLinkedList newlist = 0; Node befPtrD if(this. ==null) return newlist; for (Node clptr= //begin for if && //begin if newlist.append(clptr.element); if( head=head.next; else if(clptr==tail) +ail-bofPtrGiven the doubly linked list data structure discussed in the lecture, implement a subclass “DuplicateManipuationList” that has a new function for removing duplicates froma list.- Add a new method to your DuplicateManipuationList called removeDuplicates(…). Themethod takes as an argument called ListToRemove that is a singly linked list thatcontains some values. The method should scan the linked list for each member of theListToRemove, and remove all occurrences (not only the duplicates) of that member.Besides updating the DuplicateManipulationList, the removeDuplicates(…) functionshould return a new list that shows the number of duplicates for each deleted member.Note: That with inheritance:- You have a parent class called “Node” that contain [data, *next, *prev] and a sub classcalled “DuplicateManipuationList”
- head 7. Answer the questions considering the figure above. The list that you see above is a doubly DNode{ public T value, public DNode next, public DNode prev ..} When this list was created, they forgot to link the prev field of the nodes. Write a method existing list. Your method will be in the DoublyLinkedList class, so it does not need to tak since you will have an access to head.Create a DeleteDuplicatesclass which consists of a deleteDuplicates method which takes the nums list as its parameter. Implement the deleteDuplicates method: Check if the input list is null or empty, and return an empty list if so. Initialize a pointer i to keep track of the unique elements. Use a for loop to Iterate through the list using another pointer j which starts at j=1 and goes until j=nums.size(); If the current element at j is not equal to the previous element at i using !nums.get(i).equals(nums.get(j), increment i and set the current element at j to the new position at i using nums.set(i, nums.get(j)). After the for loop ends, return the sublist from the beginning to i + 1, as this will contain all unique elements. Call the deleteDuplicates method with the sample list as argument: Call the deleteDuplicates method and pass the nums list as argument Store the result in a variable result Print the result to the console. Input: [1, 1, 2, 3, 3,…Trying this again since part of my question keeps disappearing Given main() in the ShoppingList class, define an insertAtEnd() method in the ItemNode class that adds an element to the end of a linked list. DO NOT print the dummy head node. Ex. if the input is: 4 Kale Lettuce Carrots Peanuts where 4 is the number of items to be inserted; Kale, Lettuce, Carrots, Peanuts are the names of the items to be added at the end of the list. The output is: Kale Lettuce Carrots Peanuts public class ItemNode { private String item; private ItemNode nextNodeRef; // Reference to the next node public ItemNode() { item = ""; nextNodeRef = null; } // Constructor public ItemNode(String itemInit) { this.item = itemInit; this.nextNodeRef = null; } // Constructor…