import java.util.*;
Queue<Integer> queue = new LinkedList<Integer>();
// use non-primative types when constructing
// to add a value to the back of queue:
queue.add(7);
// to remove and return front value:
int next = queue.remove();
// to just return front value without removing:
int peek = queue.peek();Queue<Integer> queue=new ArrayList<Integer>();import java.util.*;
public class Main {
public static void main(String[] args) {
Queue<Integer> q1 = new LinkedList<Integer>();
//Add elements to the Queue
q1.add(10);
q1.add(20);
q1.add(30);
q1.add(40);
q1.add(50);
System.out.println("Elements in Queue:"+q1);
//remove () method =>removes first element from the queue
System.out.println("Element removed from the queue: "+q1.remove());
//element() => returns head of the queue
System.out.println("Head of the queue: "+q1.element());
//poll () => removes and returns the head
System.out.println("Poll():Returned Head of the queue: "+q1.poll());
//returns head of the queue
System.out.println("peek():Head of the queue: "+q1.peek());
//print the contents of the Queue
System.out.println("Final Queue:"+q1);
}
}// LinkedList implementation of Queue
Queue<String> animal1 = new LinkedList<>();
// Array implementation of Queue
Queue<String> animal2 = new ArrayDeque<>();
// Priority Queue implementation of Queue
Queue<String> animal 3 = new PriorityQueue<>();//this a basic one
public class prosses {
int [] s;
int quu;
int tu;
prosses () {//constructor
s = new int[20];
quu = -1;
tu = 0;
}
void enqueue (int d) {//for input and prosses
if (quu >= 19) {
System.out.println("stack is full");
} else {
s[++quu] = d;
}
}
int dequeue(){//to send the output
if(quu<0 && quu>19 && tu<0 && tu>19) {
System.out.println("not possible");
return 'n';
}
return s[tu++];
}
}