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); }} ```javapublic 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 MagazineNode(mag); MagazineNode current; if (list == null) list = node; else { current = list; while (current.next != null) current = current.next; 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 MagazineList class. ******************************************************************/}class MagazineNode{ public Magazine magazine; public MagazineNode next; //----------------------------------------------------------------- // Sets up the node //----------------------------------------------------------------- public MagazineNode(Magazine mag) { magazine = mag; next = null; }}```### ExplanationThis Java program consists of two classes: `MagazineList` and `MagazineNode`. The purpose of these classes is to manage a linked list of magazines. 1. **MagazineList Class** - **Attributes:** - `private MagazineNode list`: This is the head of the linked list. - **Methods:** - `public MagazineList()`: Initializes an empty list of magazines by setting `list` to `null`. - `public void add(Magazine mag)`: This method adds a new `MagazineNode` containing the magazine to the end of the linked list. If the list is initially empty, it sets the new node as the head of the list. Otherwise, it traverses the list to the last node and adds the new node there. - `public String toString()`: Returns a string representation of the magazine list by traversing all nodes and concatenating their magazine information.2. **MagazineNode Class** - **Attributes:** - `public Magazine

Although there is two classing operation on queue. although added toString and isEmtpy as third . public class MagazineList { private MagazineNode list; // ----------------------------------------------- // Sets up an initially empty list of magazine // ----------------------------------------------- public MagazineList() { list = null; } // ----------------------------------------------- // Create a new MagazineNode object and adds it // to the end of the linked list // ----------------------------------------------- public void add(Magazine mag) { MagazineNode node = new MagazineNode(mag); MagazineNode current; if (list == null) list = node; else { current = list; while (current.next != null) current = current.next; current.next = node; } } // ----------------------------------------------------- // deletes a node from front of the queue // ---------------------------------------------------- public Magazine remove() { if (list == null) return null; Magazine mg = list.magazine; list = list.next; return mg; } public boolean isEmpty() { return list == null; } public String toString() { String ans = ""; MagazineNode mg = list; while (mg != null) { ans += mg.magazine; mg = mg.next; if (mg != null) ans += " -> "; } return ans + " -> END"; } } class MagazineNode { public Magazine magazine; public MagazineNode next; // -------------------------------------------------- // Sets up the node // -------------------------------------------------- public MagazineNode(Magazine mag) { magazine = mag; next = null; } }

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);
}
}

```java
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 MagazineNode(mag);
MagazineNode current;

if (list == null)
list = node;
else
{
current = list;
while (current.next != null)
current = current.next;
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 MagazineList class.
******************************************************************/
}

class MagazineNode
{
public Magazine magazine;
public MagazineNode next;

//-----------------------------------------------------------------
// Sets up the node
//-----------------------------------------------------------------
public MagazineNode(Magazine mag)
{
magazine = mag;
next = null;
}
}
```

### Explanation

This Java program consists of two classes: `MagazineList` and `MagazineNode`. The purpose of these classes is to manage a linked list of magazines.

1. **MagazineList Class**
- **Attributes:**
- `private MagazineNode list`: This is the head of the linked list.
- **Methods:**
- `public MagazineList()`: Initializes an empty list of magazines by setting `list` to `null`.
- `public void add(Magazine mag)`: This method adds a new `MagazineNode` containing the magazine to the end of the linked list. If the list is initially empty, it sets the new node as the head of the list. Otherwise, it traverses the list to the last node and adds the new node there.
- `public String toString()`: Returns a string representation of the magazine list by traversing all nodes and concatenating their magazine information.

2. **MagazineNode Class**
- **Attributes:**
- `public Magazine

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