Add the three classic operations of Queues in the MagazineList.java to make it become a queue. Add testing code in MagazineRack.java to test your code. (You do not need to modify Magazine.java)Magazine.java :public class Magazine {private String title;//-----------------------------------------------------------------// Sets up the new magazine with its title.//-----------------------------------------------------------------public Magazine(String newTitle){ title = newTitle;}//-----------------------------------------------------------------// Returns this magazine as a string.//-----------------------------------------------------------------public String toString(){return title;}}MagazineList.java : attached the image belowMagazineRack.java:public class MagazineRack{//----------------------------------------------------------------// Creates a MagazineList object, adds several magazines to the// list, then prints it.//----------------------------------------------------------------public static void main(String[] args){ MagazineList rack = new MagazineList();rack.add(new Magazine("Time"));rack.add(new Magazine("Woodworking Today"));rack.add(new Magazine("Communications of the ACM"));rack.add(new Magazine("House and Garden"));rack.add(new Magazine("GQ"));System.out.println(rack); }} publicpublic class MagazineListprivate MagazineNode list;}//---// Sets up an initially empty list of magazines.//----public MagazineList(){list = null;}//--// Creates a new MagazineNode object and adds it to the end of// the linked list.//-----public void add (Magazine mag){MagazineNode node = new Magazine Node (mag);MagazineNode current;if (list== null)list node;else{current list;while (current.next != null)current.next;currentcurrent.next = node;}}public String toString(){String result = "";MagazineNode current = list;while (current != null){}result + current.magazine + "\n";current current.next;}return result;} /*// An inner class that represents a node in the magazine list.// The public variables are accessed by the Magazine List class.}class MagazineNode{public Magazine magazine;public MagazineNode next;//--// Sets up the node11.public Magazine Node (Magazine mag){magazine mag;next = null;

Although there is two classing operation on queue. although added toString and isEmtpy as third .…

Answered: Add the three classic operations of…

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

Add the three classic operations of Queues in the MagazineList.java to make it become a queue. Add testing code in MagazineRack.java to test your code. (You do not need to modify Magazine.java)

Magazine.java :

public class Magazine
{
private String title;
//-----------------------------------------------------------------
// Sets up the new magazine with its title.
//-----------------------------------------------------------------
public Magazine(String newTitle)
{
title = newTitle;
}
//-----------------------------------------------------------------
// Returns this magazine as a string.
//-----------------------------------------------------------------
public String toString()
{
return title;
}
}

MagazineList.java : attached the image below

MagazineRack.java:

public class MagazineRack
{
//----------------------------------------------------------------
// Creates a MagazineList object, adds several magazines to the
// list, then prints it.
//----------------------------------------------------------------
public static void main(String[] args)
{
MagazineList rack = new MagazineList();

rack.add(new Magazine("Time"));
rack.add(new Magazine("Woodworking Today"));
rack.add(new Magazine("Communications of the ACM"));
rack.add(new Magazine("House and Garden"));
rack.add(new Magazine("GQ"));

System.out.println(rack);
}
}

public
public class MagazineList
private MagazineNode list;
}
//---
// Sets up an initially empty list of magazines.
//----
public MagazineList()
{
list = null;
}
//--
// Creates a new MagazineNode object and adds it to the end of
// the linked list.
//-----
public void add (Magazine mag)
{
MagazineNode node = new Magazine Node (mag);
MagazineNode current;
if (list== null)
list node;
else
{
current list;
while (current.next != null)
current.next;
current
current.next = node;
}
}
public String toString()
{
String result = "";
MagazineNode current = list;
while (current != null)
{
}
result + current.magazine + "\n";
current current.next;
}
return result;
} /*
// An inner class that represents a node in the magazine list.
// The public variables are accessed by the Magazine List class.
}
class MagazineNode
{
public Magazine magazine;
public MagazineNode next;
//--
// Sets up the node
11.
public Magazine Node (Magazine mag)
{
magazine mag;
next = null;

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