Write a Java method that prints the middle car in the queue
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
i need the answer quickly
![Write a Java method that prints the middle car in the
queue
class Car {
int pNum;
Car next, pre;
public void enqueue(int pn){ I/ O(1)
iffisEmpty()){
front = new Car(pn, null, null); |
creating new object
rear = front;
public Car(int pn, Car n, Car p){
elsel
Car c= new Car(pn, null, rear);
pNum = pn;
next = n;
rear.setNext(c);
pre = p;
rear = c;
size++;
public void setPNum(int pn){
pNum = pn;
public Car dequeu(){ // O(1)
iffisEmpty())
return null;
public void setNext(Car n){
next = n;
Car c= front;
public void setPre(Car p){
if(size == 1){
front = null;
rear = null;
pre = p;
public int getPNum()(
else{
front = front.next();
c.setNext(null);
front.setPre(null);
return pNum;
public Car next(){
return next;
size-
return c;
public Car pre(
){
return pre;
public static void main(String args[]){
QueueService q = new QueueService();
MI class Car
class QueueService
Car front, rear;
int size;
if(q.isEmpty())
System.out.printin("Empty");
public QueueService(){
q.enqueue(1005)
size = 0;
front = null;
q.enqueue(1006)
q.enqueue(1007)
rear = null;
System.out.printin("Front car: "+
q.front().getPNum())
q.enqueue(1004)
System.out.printin("Front car: "+
;q.front().getPNum())
System.out.printlin("Size: "+ q.size()
public int size(){
return size;
public Car front(0(
return front;
System.out.printin("Car "+
;q.dequeu().getPNum() +" was serviced")
System.out.printin("Front car: " +
public boolean isEmpty(){
if(size == 0)
q.front().getPNum0)
return true;
System.out.printin("Size: " +q.size())
else
return false;](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F02be6f9f-bc7c-4d93-90ef-2c6d3b9bbb6b%2F21cf60a8-8e5b-49c2-976d-5ed86e8b5986%2Faohxsr_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Write a Java method that prints the middle car in the
queue
class Car {
int pNum;
Car next, pre;
public void enqueue(int pn){ I/ O(1)
iffisEmpty()){
front = new Car(pn, null, null); |
creating new object
rear = front;
public Car(int pn, Car n, Car p){
elsel
Car c= new Car(pn, null, rear);
pNum = pn;
next = n;
rear.setNext(c);
pre = p;
rear = c;
size++;
public void setPNum(int pn){
pNum = pn;
public Car dequeu(){ // O(1)
iffisEmpty())
return null;
public void setNext(Car n){
next = n;
Car c= front;
public void setPre(Car p){
if(size == 1){
front = null;
rear = null;
pre = p;
public int getPNum()(
else{
front = front.next();
c.setNext(null);
front.setPre(null);
return pNum;
public Car next(){
return next;
size-
return c;
public Car pre(
){
return pre;
public static void main(String args[]){
QueueService q = new QueueService();
MI class Car
class QueueService
Car front, rear;
int size;
if(q.isEmpty())
System.out.printin("Empty");
public QueueService(){
q.enqueue(1005)
size = 0;
front = null;
q.enqueue(1006)
q.enqueue(1007)
rear = null;
System.out.printin("Front car: "+
q.front().getPNum())
q.enqueue(1004)
System.out.printin("Front car: "+
;q.front().getPNum())
System.out.printlin("Size: "+ q.size()
public int size(){
return size;
public Car front(0(
return front;
System.out.printin("Car "+
;q.dequeu().getPNum() +" was serviced")
System.out.printin("Front car: " +
public boolean isEmpty(){
if(size == 0)
q.front().getPNum0)
return true;
System.out.printin("Size: " +q.size())
else
return false;
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