This document discusses queues as a data structure. Some key points:
- Queues follow the FIFO (first in, first out) principle and have two main operations - enqueue to insert at the rear, and dequeue to remove from the front.
- Queues can be implemented using arrays or linked lists. Array implementation uses front and rear pointers to track the first and last elements while linked list uses pointers between nodes.
- Common applications of queues include task scheduling, disk I/O handling, media playback lists, call centers, and simulation of waiting lines where the first entry is the first to be served.
An ordered collection of items from which items may be deleted from one end called the front and into which items may be inserted from other end called rear is known as Queue.
It is a linear data structure.
It is called the First In First Out (FIFO) list. Since in queue, the first element will be the first element out.
An ordered collection of items from which items may be deleted from one end called the front and into which items may be inserted from other end called rear is known as Queue.
It is a linear data structure.
It is called the First In First Out (FIFO) list. Since in queue, the first element will be the first element out.
Queues
a. Concept and Definition
b. Queue as an ADT
c. Implementation of Insert and Delete operation of:
• Linear Queue
• Circular Queue
For More:
https://github.com/ashim888/dataStructureAndAlgorithm
http://www.ashimlamichhane.com.np/
Java Queue represents an ordered list of elements. Java Queue follows FIFO order to insert and remove it's elements. FIFO stands for First In First Out. Java Queue supports all methods of Collection interface. Most frequently used Queue implementations are LinkedList, ArrayBlockingQueue and PriorityQueue
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Queues
a. Concept and Definition
b. Queue as an ADT
c. Implementation of Insert and Delete operation of:
• Linear Queue
• Circular Queue
For More:
https://github.com/ashim888/dataStructureAndAlgorithm
http://www.ashimlamichhane.com.np/
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Even though at surface level ‘java.lang.OutOfMemoryError’ appears as one single error; underlyingly there are 9 types of OutOfMemoryError. Each type of OutOfMemoryError has different causes, diagnosis approaches and solutions. This session equips you with the knowledge, tools, and techniques needed to troubleshoot and conquer OutOfMemoryError in all its forms, ensuring smoother, more efficient Java applications.
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2. Queue
• A data structure that has access to its data at the front and rear
• Operates on FIFO (First In First Out) method
• Has two operations
• Enqueue: inserting data at the rear of the queue
• Dequeue: removing data at the front of the queue
2
front
rear
enqueue
dequeue
A
B
C
5. Queue
• FIFO Principle of Queue:
– A Queue is like a line waiting to purchase tickets, where
the first person in line is the first person to be served. (i.e.,
First come first serve).
– The first entry that will be removed from the queue, is
called the front of the queue
– The one most recently added, is called the rear
5
6. Queue
• Basic Operations of Queue
• Enqueue(): Add an element to the end of the queue.
• Dequeue(): Remove an element from the front of the
queue.
• IsEmpty(): Check if the queue is empty.
• IsFull(): Check if the queue is full.
• Peek(): Get the value of the front of the queue without
removing it.
6
7. Queue
• Basic Operations of Queue
• peek(): Algorithm
•Implementation
7
int peek()
{
return queue[front];
}
begin procedure peek
return queue[front]
end procedure
8. Queue
• Basic Operations of Queue
•isfull(): Algorithm
Implementation
8
begin procedure isfull
if rear equals to MAXSIZE
return true
else
return false
endif
end procedure
bool isfull()
{
if(rear == MAXSIZE - 1)
return true;
else
return false;
}
9. Queue
• Basic Operations of Queue
• isempty(): Algorithm
9
begin procedure isempty
if front is less than MIN OR front is greater than rear
return true
else
return false
endif
end procedure
10. Queue
• Basic Operations of Queue
• isempty(): Implementation
• If the value of front is less than MIN or 0, it tells that the queue
is not yet initialized, hence empty.
10
bool isempty()
{
if(front < 0 || front > rear)
return true;
else
return false;
}
11. Queue
Queue operations work as follows:
• Two pointers, FRONT and REAR, are required
• FRONT track the first element of the queue
• REAR track the last element of the queue
• Initially, set value of FRONT and REAR to -1
11
12. Queue
enqueue()
• Steps to enqueue (insert) data into a queue:
1. Check if the queue is full or not
2. If the queue is full, produce overflow error and exit.
3. If the queue is not full, increment rear pointer to point the next
empty space.
4. Add data element to the queue location, where the rear is pointing.
5. return success.
12
13. Queue
enqueue()
13
Algorithm Implementation
begin procedure enqueue(data)
if queue is full
return overflow
endif
rear ← rear + 1
queue[rear] ← data
return true
end procedure
int enqueue(int data)
{
if(isfull())
return 0;
rear = rear + 1;
queue[rear] = data;
return 1;
}
14. Queue
dequeue()
• steps to perform dequeue operation:
1. Check if the queue is empty or not.
2. If the queue is empty, produce underflow error and exit.
3. If the queue is not empty, access the data where front is pointing.
4. Increment front pointer to point to the next available data element.
5. Return success.
14
15. Queue
dequeue()
15
Algorithm Implementation
begin procedure dequeue
if queue is empty
return underflow
endif
data = queue[front]
front ← front + 1
return true
end procedure
int dequeue()
{
if(isempty())
return 0;
int data = queue[front];
front = front + 1;
return data;
}
16. Typesof Queue
16
In Linear Queue, an insertion takes
place from one end while the
deletion occurs from another end.
It is similar to the linear Queue
except that the last element of
the queue is connected to the
first element.
It is a special type of queue
data structure in which every
element has a priority
associated with it.
In Double Ended Queue, insertion and
deletion can be done from both ends of the
queue either from the front or rear.
17. Queue Implementation
• Two ways of implementing the Queue: Array and Linked list.
Using Array
17
void enqueue(int queue[], int item)
{
if (isfull())
{
cout<<"overflow";
}
else
{
rear = rear + 1;
queue[rear]=item;
}
}
int dequeue (int queue[], int item)
{
if (isempty())
{
cout<<"underflow";
}
else
{
item = queue[front];
front = front + 1;
return item;
}
}
18. Queue Implementation
• Two ways of implementing the Queue: Array and Linked list.
Using Linked List
18
void enqueue(struct node *ptr, int item) {
ptr = (struct node *) malloc (sizeof(struct
node)); if(ptr == NULL) {
cout<<"nOVERFLOWn";
return; }
else {
ptr -> data = item;
if(front == NULL) {
front = ptr;
rear = ptr;
front -> next = NULL;
rear -> next = NULL; }
else {
rear -> next = ptr;
rear = ptr;
rear->next = NULL; } } }
void dequeue
(struct node *ptr)
{
if(front == NULL)
{
cout<<"nUNDERFLOWn
";
return;
}
else
{
ptr = front;
front = front -> next;
delete ptr;
}
}
19. Applicationof Queue
i. In operating systems for handling interrupts
ii. To maintain the play list in media players in order to add and
remove the songs from the play-list.
iii. Disk Driver- maintains a queue of disk input/output requests
iv. Task scheduler in multiprocessing system- maintains priority
queues of processes
v. Telephone calls in a busy environment –maintains a queue of
telephone calls
vi. Simulation of waiting line- maintains a queue of persons
19