Exercise 2: Add a method boolean contains (Object obj) that checks whether the LinkedList implementation contains a given object. Implement this method by directly traversing the links, not by using an iterator. Write a tester class to check your method.
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- Implement unique method that takes an ArrayList as input and returns an ArrayList withexactly a single occurrence of each element from the input list. For example, if the input listcontains 5, 6, 7, 6, 3, 5, 5, 4 then the output list should have 5, 6, 7, 3, 4.Note: (1) You may assume that the ArrayList has a specific type of elements in it. In the class, we assumedit to have String type values. (2) You may only work with ArrayList(s).Write a method called changeQueue to be considered inside the ArrayQueue class and has one parameter item of type E. Your method will change the queue in such a way that if the the first element of the queue and the last element of the queue are equal, the first and last elements in the queue will be replaced with item, otherwise, do not do any change. Similarly, the same process is done for the second element in the queue and the element before the last in the queue and so on. Assume you have a non-empty queue with even number of elements. You are not allowed to call any method from the the ArrayQueue class. Do not use iterators. Method head: public void changeQueue(E item) Example1: Before run: front rear “this” queue: 10 29 2 2 5 10 Item1: 100 After run: front rear “this” queue: 100 29 100 100 5 100implemented The Peek method by calling the Item method with theindex variable as the argument. The Clear method simply calls an identicalmethod in the ArrayList class. The Count property is written as a read-onlyproperty since we don’t want to accidentally change the number of items onthe stack
- 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…Given the MileageTrackerNode class, complete main() in the MileageTrackerLinkedList class to insert nodes into a linked list (using the insertAfter() method). The first user-input value is the number of nodes in the linked list. Use the printNodeData() method to print the entire linked list. DO NOT print the dummy head node. Ex. If the input is: 3 2.2 7/2/18 3.2 7/7/18 4.5 7/16/18 the output is: 2.2, 7/2/18 3.2, 7/7/18 4.5, 7/16/18 public class MileageTrackerNode { private double miles; // Node data private String date; // Node data private MileageTrackerNode nextNodeRef; // Reference to the next node public MileageTrackerNode() { miles = 0.0; date = ""; nextNodeRef = null; } // Constructor public MileageTrackerNode(double milesInit, String dateInit) { this.miles =…Implement an instance method, called getFirstHalf, that belongs to yourThingLinkedBag. The method returns as output a linked list that includes allvalues in the first half of the bag's linked list. For example, for the following bag3-->5-->8-->9. the method returns 3-->5.If the bag includes an odd number of nodes, then the middle element belongs tothe first half and is included in the output.Make sure to include the methodheader. The bag should remain unchanged (i.e., do not remove the returnedvalues from the bag).
- Suppose we want to extend the PositionalList ADT with a method, indexOf(p), that returns the current index of the element stored at position p. Write this method using only other methods of the PositionalList interface (not details of our LinkedPositionalList implementation). Write the necessary code to test the method. Hint: Count the steps while traversing the list until encountering position p public interface PositionalList<E> extends Iterable<E> { int size(); boolean isEmpty(); Position<E> first(); Position<E> last(); Position<E> before(Position<E> p) throws IllegalArgumentException; Position<E> after(Position<E> p) throws IllegalArgumentException; Position<E> addFirst(E e); Position<E> addLast(E e); Position<E> addBefore(Position<E> p, E e) throws IllegalArgumentException; Position<E> addAfter(Position<E> p, E e) throws IllegalArgumentException; E set(Position<E> p, E e) throws…Implement a lastIndex method for the LinkedIntList class you worked on for HW4. This method takes an int argument and returns the largest index such that the int argument appears at that index in the list. If the int argument does not appear in the list, then -1 is returned. For example if the list example contained the numbers [4, -1, 2, 7, -1, 3] in that order, then example.lastIndex(-1) should return 4 and example.lastIndex(5) should return -1. In the text area below, write the definition of the lastIndex method. (In other words, write the code that should replace the //TODO comment.) Your code cannot call any methods. public class LinkedIntList { private class Node { private int item; private Node next; public Node() {} public Node(int number, Node nextNode) { item = number; next = nextNode; } } private Node first; // first node of the list public LinkedIntList() { first = null;…How to answer the following questions? Here is a, possibly flawed, approach for using a traversal to print the contents of the linked list of strings accessed through letters. Indicate the description that best matches the code. LLNode<String> currNode = letters; while (currNode != null) { System.out.println(currNode.getInfo()); if (currNode.getLink() != null) currNode = currNode.getLink(); else currNode = null; } A. very good B. correct but inefficient C. correct but too complex D. will bomb if list is empty E. will bomb if list is not empty What is the result of evaluating the following postfix expression? 6 4 + * 3 10 + A. 0 B. 3 C. too many operands D. too few operands stack implementations throw an exception if a pop is attempted on an empty stack. A valid alternate approach to handling this situation is to: A. ignore it B. state as a precondition that pop will not be attempted on an empty stack. C. have the pop operation return a boolean indicating success.…
- Add a constructor to SeparateChainingHashST that gives the client the abilityto specify the average number of probes to be tolerated for searches. Use array resizingto keep the average list size less than the specified value, and use the technique describedon page 478 to ensure that the modulus for hash() is primeimplemente The Peek method by calling the Item method with the index variable as the argument. The Clear method simply calls an identical method in the ArrayList class. The Count property is written as a read-only property since we don’t want to accidentally change the number of items on the stackWrite 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