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- We have two classes; these classes are "Car" and "Price".The "car" class is a class that keeps the id and price of the car.If the "Price" class is, there will be get / set methods for the segment of the fee (For example Y segment Z segment), the number of cars, and the "Car" class list.In the "Price" class, there should be a print method to add / remove cars to the list and find the ids of Vehicles whose segments are equal to X.The segments are as follows. 0$ -15999$ -> Y Segment16000$-24999$ -> Z Segment25000$-50000$ -> T Segment It is necessary to use "Single Linked List".The program should be written in JAVA.Question 5 Assume that the following method is in a class called DLL (not same as KWLinkedList). What does this method do? public void method_LI( ) { KWLinkedList<Integer> list = new KWLinkedList<Integer>( ); list.add(2); list.add(-1); list.add(0); list.add(1); list.add(0); ListIterator<integer> iter = list.listIterator(); while(iter.hasNext()) { if (iter.next() == 0) iter.remove(); } if( iter.hasPrevious() ) System.out.println("END"); else while(iter.hasNext()) System.out.print(iter.next() + " "); } Removes the nodes having 0 as its data and prints END. Removes the nodes having 0 as its data and prints 2 -1 1 Removes the nodes having 0 as its data and prints 1 -1 2 Prints 2 -1 0 1 0 without removing anything.Using java, answer the following questions about the code below. 1) Create a new function or method that checks to see if an int parameter is present in the list. 2) Create a main() method or JUnit tests to show that your list code functions as intended. (Code) private class Nodeint data;Node next;Node(int data) {this.data = data;this.next = null;}}private Node first;private Node last; public void addToEnd(int data){ Node newNode = new Node(data);if (first == null){first = newNode;last = newNode;} else {last.next = newNode;last = newNode;}}public void printList(){ Node current = first;while (current != null){System.out.print(current.data + " ");current = current.next;}System.out.println();}public static void main(String[] args){node list = new node();list.addToEnd(2);list.addToEnd(4);list.addToEnd(6);list.printList();}}
- pet shop wants to give a discount to its clients if they buy one or more pets and at least five other items. The discount is equal to 20 percent of the cost of the other items, but not the pets.Use a class Item to describe an item, with any needed methods and a constructor public Item(double price, boolean isPet, int quantity)An invoice holds a collection of Item objects; use an array list to store them. In the Invoice class, implement methods public void add(Item anItem)public double getDiscount()Write a program that prompts a cashier to enter each price and quantity, and then a Y for a pet or N for another item. Use a price of –1 as a sentinel. In the loop, call the add method; after the loop, call the getDiscount method and display the returned value.How to pass this test case? Please public void testDao(){ MessageDao.reset(); MessageDao messageDao = MessageDao.getInstance(); Assert.assertEquals(messageDao, MessageDao.getInstance()); // test that constructor is private List<Constructor> constructors = Arrays.asList(MessageDao.class.getConstructors()); Assert.assertEquals(constructors.size(), 0); constructors = Arrays.asList(MessageDao.class.getDeclaredConstructors()); Assert.assertEquals(constructors.size(), 1); Assert.assertTrue(Modifier.isPrivate(constructors.get(0).getModifiers())); } We are supposed to fill this out in order to pass this test: package dao; import dto.MessageDto; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; // TODO fill this out public class MessageDao implements BaseDao<MessageDto> { private static MessageDao instance = new MessageDao(); public static MessageDao getInstance() { } // TODO fill this out @Override public void put(MessageDto…In a demo class, write a public static method called removeLastOccurenceTen that receives a reference parameter named list of type LLNode of integer values. Your method should remove the node that contains the last occurrence of the number 10 in the list, if exist.
- In the existing DoublyLinkedList class, write and test a non-static method named reverseList to reverse a doubly linked list. Write the testing code in the main method of the class DoublyLinkedList. For this purpose, you must only use and update the DoublyLinkedList.java file provided in Lesson2Examples posted in the eCentennial module “Lesson Examples (from textbook)” package Ex2; public class DoublyLinkedList<E> { private static class Node<E> { private E element; // reference to the element stored at this node private Node<E> prev; // reference to the previous node in the list private Node<E> next; // reference to the subsequent node in the list public Node(E e, Node<E> p, Node<E> n) {element = e;prev = p;next = n;} // public accessor methodspublic E getElement() { return element; } public Node<E> getPrev() { return prev; } public Node<E> getNext() { return next; } // Update methodspublic void setPrev(Node<E> p) { prev = p; }…Write a static method called "removeDuplicates" that takes an ArrayList of Strings as a parameter. It should first sort the ArrayList using the sort function of the Containers helper class and then remove any duplicates so that only one of any series of duplicates remains in the ArrayList. For example, suppose that the parameter is an ArrayList named a containing: ["clam", "squid", "squid", "squid", "clam", "octopus", "octopus", "shrimp"] Then after calling “removeDuplicates(list)” the ArrayList a should contain: ["clam", "octopus", "shrimp", "squid"] Please note: quotation marks would not appear in the actual output of the ArrayList, they are only included here for clarity. The actual ArrayList output would be: [clam, octopus, shrimp, squid] You may use the following code to test your program: Expected output is listed to the right of the print statement. import java.util.*;public class RemoveDuplicates { public static void main(String[] args) {…Create the compareTo method for a class that represents an individual whose first and last names are stored as two Strings. In an alphabetical list of people with last names first and then first names, one individual is "less than" another if they come before the other.(as is typical).
- Need help writing the method: getWaitlistedIDs() – returns an array of type int[], namely the ids of students in the waitlist. public int[] getWaitlistedIDs() { // insert solution here and modify the return statement return null; } For context public class Course { public String code; public int capacity; public SLinkedList<Student>[] studentTable; public int size; public SLinkedList<Student> waitlist; public Course(String code) { this.code = code; this.studentTable = new SLinkedList[10]; this.size = 0; this.waitlist = new SLinkedList<Student>(); this.capacity = 10; } public Course(String code, int capacity) { this.code = code; this.studentTable = new SLinkedList[capacity]; this.size = 0; this.waitlist = new SLinkedList<>(); this.capacity = capacity; }Write a method called compareSum to be considered in a class outside the KWArrayList class. This method has a parameter list of class type KWArrayList . The method finds the summation of even elements for the first half of list and the summation of odd elements for the second half of list, then compares between the two summations and returns the greater sum. Assume the length of List is even. Method heading: public static int compareSum( KWArrayList<Integer> list) Before run: list= 10 5 50 3 14 33 20 5 (note: the numbers in bold represent the first half) After run: list= 3 5 50 14 33 20 5 Sum1 (for the first half) = 60 Sum2 (for the second half) = 38 Returned value is 60A) Consider the generic print() method, write a method that takes an array of E, where E must be Comparable or extend a type that is Comparable, and returns a reference to the greatest object in the array. In this case, the greatest value is one for which compareTo() would return 0 or more for any other object in the array. If there is more than one possible largest value (these would have to be equal to each other but greater than any other objects in the array), it does not matter which one you choose. B) Write a generic Java queue class (a plain queue, not a priority queue). Call it GenericQueue, because the JDK already has an interface called Queue. The class must be able to create a queue of objects of any reference type. Consider the GenericStack class shown in the lecture notes for some hints. Like the Stack, the GenericQueue should use an underlying ArrayList<E>. Write these methods and any others you find useful: enqueue() adds an E to the queue peek() returns a…