import java.util.ArrayList;

public class QuequeWithArrayList {

ArrayList<Integer> al = new ArrayList<>();

// adding the element into the queque ??

public void enque (int data) {

al.add(data);

}

public int dequeue () {

// remove the element which is the firsr element inserted in the arraylist / queque

// is Queque is empty or not

if(isEmpty()) {

return -1;

}

int rear = al.get(al.size()-1);

al.remove(al.size()-1);

return rear;

}

// is full condition not needed

public boolean isEmpty () {

return al.size()==0;

}

public static void main(String[] args) {

}

}