Queue
The Queue interface in Java represents a collection of elements that supports insertion, removal, and retrieval operations. It follows the First-In-First-Out (FIFO) order, where the element that is inserted first is the first one to be removed.
To use the Queue interface, you need to import the java.util.Queue package.
Here's an example that demonstrates the usage of the Queue interface:
TEXT/X-JAVA
1import java.util.LinkedList;
2import java.util.Queue;
3
4public class Main {
5
6 public static void main(String[] args) {
7 // Create a queue
8 Queue<String> queue = new LinkedList<>();
9
10 // Adding elements to the queue
11 queue.add("Alice");
12 queue.add("Bob");
13 queue.add("Charlie");
14
15 // Printing the queue
16 System.out.println("Queue: " + queue);
17
18 // Accessing the front element of the queue
19 String frontElement = queue.peek();
20 System.out.println("Front element: " + frontElement);
21
22 // Removing elements from the queue
23 String removedElement = queue.poll();
24 System.out.println("Removed element: " + removedElement);
25
26 // Printing the updated queue
27 System.out.println("Updated Queue: " + queue);
28
29 // Checking if the queue is empty
30 boolean isEmpty = queue.isEmpty();
31 System.out.println("Is Queue empty: " + isEmpty);
32
33 // Checking the size of the queue
34 int size = queue.size();
35 System.out.println("Size of the queue: " + size);
36 }
37
38}xxxxxxxxxx38
}import java.util.LinkedList;import java.util.Queue;public class Main { public static void main(String[] args) { // Create a queue Queue<String> queue = new LinkedList<>(); // Adding elements to the queue queue.add("Alice"); queue.add("Bob"); queue.add("Charlie"); // Printing the queue System.out.println("Queue: " + queue); // Accessing the front element of the queue String frontElement = queue.peek(); System.out.println("Front element: " + frontElement); // Removing elements from the queue String removedElement = queue.poll(); System.out.println("Removed element: " + removedElement); // Printing the updated queue System.out.println("Updated Queue: " + queue); // Checking if the queue is emptyOUTPUT
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