Question

Suppose there is only one customer service available in SAMBA Bank in Thursday morning, in every 4 minutes a new customer arrives at the end of waiting line, each customer will need 7 minutes for the service

Write a program to print out the information after the first 60 minutes

• The time of arriving for each customer
• The time of leaving for each customer
• How many customers are in the line?
• Who is the current serving customer?

[ data structure course, solve in java, please (Hint: use the queue concept )]

Answer 1

Ans:- Java code for the above question using queue

Code:-

import java.util.*;
import java.util.LinkedList;
import java.util.Queue;
public class Customer
{
        public static void main (String[] args) throws java.lang.Exception
        {
            int no_of_users=0,no_of_customer_served=0;
             Queue<Integer> q = new LinkedList<>();
             for(int i=0;i<60;i+=4)
             {
                 no_of_users++;
                 //after every four minute the new customer was added to the Queue
                 q.add(no_of_users); 
                 // It will print the arriving time of every customer
                 System.out.println("The "+no_of_users+" customer was arrived at "+i+"minute");
             }
             System.out.println();
             int k=0;
             for(int i=0;i+7<60;i+=7)
             {
                k=i+7;
                no_of_customer_served++;
                //after every seven minute a customer leave the Queue
                q.remove();
                // It will print the arriving time of every customer
                System.out.println("The "+no_of_customer_served+" customer was leaving at "+k+"minute");
             }
             System.out.println();
             // remaining size of queue will tell the number of customer left in queue
             System.out.println("The number of customer in the line are "+q.size());
             // the customer at the top of the queue will be the current serving customer
             System.out.println();
             System.out.println("The current serving customer is "+q.peek());
            
        }
}

Output:-