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Program106.java

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// This program implements a queue using a linked list

class Node {

// Represents a node in the linked list

int data;

Node next;

Node(int data) {

this.data = data;

next = null;

}

}

class LinkedListQueue {

Node front, rear;

void enqueue(int data) {

Node newNode = new Node(data);

if (rear == null) {

front = rear = newNode;

return;

}

rear.next = newNode;

rear = newNode;

}

int dequeue() {

if (front == null) {

return -1;

}

int val = front.data;

front = front.next;

if (front == null) {

rear = null;

}

return val;

}

int peek() {

if (front == null) {

return -1;

}

return front.data;

}

boolean isEmpty() {

return front == null;

}

}

public class Program106 {

public static void main(String[] args) {

LinkedListQueue queue = new LinkedListQueue();

queue.enqueue(10);

queue.enqueue(20);

queue.enqueue(30);

System.out.println(queue.dequeue()); // 10

System.out.println(queue.peek()); // 20

System.out.println(queue.isEmpty()); // false

}

}