Question

1. Paste the code below into your Java IDE and make sure it runs correctly.

2. Create a program that receives numeric data from the user and then adds it to a queue.

3. Create a program that receives text based data and then adds it to a queue.

4. Create a program that automatically populates a queue on start up with 5 pieces of data and then displays each entry in the queue after receiving a command from the user.

Make sure you submit your coding answers to this assessment before you leave class. Make sure everyone's name is on the submission.

Prof. Nizich

package q_sample;

import java.util.LinkedList;

import java.util.NoSuchElementException;

import java.util.Queue;

public class q_sample {

    public static void main(String[] args) {

        Queue myQueue = new LinkedList();

        myQueue.offer("Monday");

        myQueue.offer("Thusday");

        boolean flag = myQueue.offer("Wednesday");

        System.out.println("Wednesday inserted successfully? "+flag);

        try {

            myQueue.add("Thursday");

            myQueue.add("Friday");

            myQueue.add("Weekend");

        } catch (IllegalStateException e) {

            e.printStackTrace();

        }

        System.out.println("Pick the head of the queue: " + myQueue.peek());

        String head = null;

        try {

            head = (String) myQueue.remove();

            System.out.print("1) Push out " + head + " from the queue ");

            System.out.println("and the new head is now: "+myQueue.element());

        } catch (NoSuchElementException e) {

            e.printStackTrace();

        }

        head = (String) myQueue.poll();

        System.out.print("2) Push out " + head + " from the queue");

        System.out.println("and the new head is now: "+myQueue.peek());

        System.out.println("Does the queue contain 'Weekend'? " + myQueue.contains("Weekend"));

        System.out.println("Does the queue contain 'Monday'? " + myQueue.contains("Monday"));

    }

}

Answer 1

//This below program is the rectifyed one and it work successfully
package com.acadgild;

import java.util.LinkedList;
import java.util.NoSuchElementException;
import java.util.Queue;

public class q_sample {
  
   public static void main(String[] args) {
      
       //changes made in the below code by adding String on both the sides of the interface as queue is an interfave class.
   Queue<String> myQueue = new LinkedList<String>();
   myQueue.offer("Monday");
   myQueue.offer("Thusday");
     
   boolean flag = myQueue.offer("Wednesday");
     
   System.out.println("Wednesday inserted successfully? "+flag);
     
   try {
   myQueue.add("Thursday");
   myQueue.add("Friday");
   myQueue.add("Weekend");
     
   } catch (IllegalStateException e) {
     
   e.printStackTrace();
   }
     
   System.out.println("Pick the head of the queue: " + myQueue.peek());
   String head = null;
     
   try {
     
   head = (String) myQueue.remove();
   System.out.print("1) Push out " + head + " from the queue ");
   System.out.println("and the new head is now: "+myQueue.element());
     
   } catch (NoSuchElementException e) {
     
   e.printStackTrace();
     
   }
     
   head = (String) myQueue.poll();
   System.out.print("2) Push out " + head + " from the queue");
   System.out.println("and the new head is now: "+myQueue.peek());
     
   System.out.println("Does the queue contain 'Weekend'? " + myQueue.contains("Weekend"));
     
   System.out.println("Does the queue contain 'Monday'? " + myQueue.contains("Monday"));
   }

}

#program -02
package com.acadgild;

import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;

public class Second {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
      
      
       Scanner scan = new Scanner(System.in);
       System.out.println("Enter the number as theinput!");
       int x= scan.nextInt();          
      
       Queue queue = new LinkedList();
       queue.add(x);
      
       for (Object object : queue) {
             
           System.out.println("Successfully added the input taken from the user"
                  + "Added to the queue"+object.toString());
          
       }
              

   }

}

#Program - 03
package com.acadgild;

import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;

public class Third {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
      
      
       Scanner scan = new Scanner(System.in);
       System.out.println("Enter the number as theinput!");
       int x= scan.nextLine();//Change the int to the Line      
      
       Queue queue = new LinkedList();
       queue.add(x);
      
       for (Object object : queue) {
             
           System.out.println("Successfully added the input taken from the user"
                  + "Added to the queue"+object.toString());
          
       }
              

   }

}

#program -04
package com.acadgild;
import java.util.*;
public class QueueDemoQueue {
static String newLine = System.getProperty("line.separator");
public static void main(String[] args) {
  
System.out.println(newLine + "Queue in Java" + newLine);
System.out.println("-----------------------" + newLine);
System.out.println("Adding items to the Queue" + newLine);
//Creating queue would require you to create instannce of LinkedList and assign
//it to Queue
//Object. You cannot create an instance of Queue as it is abstract
Queue queue = new LinkedList();
  
//you add elements to queue using add method
queue.add("A");
queue.add("B");

queue.add("C");
queue.add("D");
queue.add("E");
  
System.out.println(newLine + "Items in the queue..." + queue + newLine);

//You remove element from the queue using .remove method
//This would remove the first element added to the queue, here Java
System.out.println("remove element: " + queue.remove() + newLine);
  
//.element() returns the current element in the queue, here when "java" is removed
//the next most top element is .NET, so .NET would be printed.
System.out.println("retrieve element: " + queue.element() + newLine);
  
//.poll() method retrieves and removes the head of this queue
//or return null if this queue is empty. Here .NET would be printed and then would
//be removed
//from the queue
System.out.println("remove and retrieve element, null if empty: " + queue.poll() +
newLine);
  
//.peek() just returns the current element in the queue, null if empty
//Here it will print Javascript as .NET is removed above
System.out.println("retrieve element, null is empty " + queue.peek() + newLine);

}}