Question

1. Paste the code below into your Java IDE and make sure it runs correctly. 2....

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"));

    }

}

Homework Answers

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);

}}

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