Add missing code to turn this class a singleton in Java package com.gamingroom; import java.util.ArrayList; import java.util.List; /**  * A singleton service for the game engine */ public class GameService {  /**   * A list of the active games   */  private static List

Given the interface of the Linked-List struct Node{     int data;     Node* next = nullptr; }; class LinkedList{ private:     Node* head;     Node* tail; public:     display_at(int pos) const;     ... };   Write a definition for a method display_at. The method takes as a parameter integer that indicates the node's position which data you need to display.  Example: list: 5 -> 8 -> 3 -> 10 display_at(1); // will display 5 display_at(4); // will display 10   void LinkedList::display_at(int pos) const{      // your code will go here  }

Redesign LaptopList class from previous project public class LaptopList {       private class LaptopNode  //inner class     {         public String brand;         public double price;         public LaptopNode next;           public LaptopNode(String brand, double price)         {                // add your code         }         public String toString()         {             // add your code         }     }       private LaptopNode head; // head of the linked list       public LaptopList(String fname) throws IOException     {         File file = new File(fname);         Scanner scan = new Scanner(file);         head = null;         while(scan.hasNextLine())         {             // scan data             // create LaptopNode             // call addToHead and addToTail alternatively          }     }       private void addToHead(LaptopNode node)     {             // add your code     }       private void addToTail(LaptopNode node)     {             // add your code     }       private…

class Queue {      private static int front, rear, capacity; private static int queue[];  Queue(int c) {  front = rear = 0;  capacity = c;  queue = new int[capacity]; }  static void queueEnqueue(int data) {   if (capacity == rear) {   System.out.printf("\nQueue is full\n");   return;  }     else {   queue[rear] = data;   rear++;  }  return; }  static void queueDequeue() {    if (front == rear) {   System.out.printf("\nQueue is empty\n");   return;  }   else {   for (int i = 0; i < rear - 1; i++) {    queue[i] = queue[i + 1];   }       if (rear < capacity)    queue[rear] = 0;       rear--;  }  return; }   static void queueDisplay() {  int i;  if (front == rear) {   System.out.printf("\nQueue is Empty\n");   return;  }     for (i = front; i < rear; i++) {   System.out.printf(" %d <-- ", queue[i]);  }  return; }   static void queueFront() {  if (front == rear) {   System.out.printf("\nQueue is Empty\n");   return;  }  System.out.printf("\nFront Element is: %d", queue[front]);…

comptuer sciecne help

Exercise 2: Consider the following class: public class Sequence { private ArrayList values; public Sequence() { values = new ArrayList(); } public void add(int n) { values.add(n); } public String toString() { return values.toString(); } } Add a method public Sequence merge(Sequence other) that merges two sequences, alternating ele- ments from both sequences. If one sequence is shorter than the other, then alternate as long as you can and then append the remaining elements from the longer sequence. For example, if a is 1 4 9 16 and b is 9 7 4 9 11 then a.merge(b) returns the sequence 1 9 4 7 9 4 16 9 11 without modifying a or b.

package circularlinkedlist;import java.util.Iterator; public class CircularLinkedList<E> implements Iterable<E> { // Your variablesNode<E> head;Node<E> tail;int size; // BE SURE TO KEEP TRACK OF THE SIZE // implement this constructorpublic CircularLinkedList() {} // I highly recommend using this helper method// Return Node<E> found at the specified index// be sure to handle out of bounds casesprivate Node<E> getNode(int index ) { return null;} // attach a node to the end of the listpublic boolean add(E item) {this.add(size,item);return false; } // Cases to handle// out of bounds// adding to empty list// adding to front// adding to "end"// adding anywhere else// REMEMBER TO INCREMENT THE SIZEpublic void add(int index, E item){ }   // remove must handle the following cases// out of bounds// removing the only thing in the list// removing the first thing in the list (need to adjust the last thing in the list to point to the beginning)// removing the last…