Question

Write a Console Java program that inserts 25 random integers in the range of 0 to 100 into a Linked List.

(Use SecureRandom class from java.security package.
SecureRandom rand = new SecureRandom(); - creates the random number object
rand.nextInt(100) - generates random integers in the 0 to 100 range)

Using a ListItreator output the contents of the LinkedList in the original order.

Using a ListItreator output the contents of the LinkedList in the reverse order.

Answer 1

Note: Variable names and object names are used arbitrarily. These can be changed according to the user's choice. Please refer to code snippets for a better understanding of comments and indentations.

IDE Used: Eclipse

Program Code

import java.util.*;
import java.security.SecureRandom;

public class randomlist {

   public static void main(String[] args) {
      
       // iterator variable for inserting 25 random integer
       int itr;
      
       // create an object of linkedlist class
       LinkedList<Integer> rand_list = new LinkedList<Integer>();
      
       // create an object of secure random class to generate random number
       SecureRandom sec_rand = new SecureRandom();
      
       // generate secure random number of range 0 to 100 and insert in the linked list
       for(itr= 0; itr < 25; itr++)
       {
           rand_list.add(sec_rand.nextInt(100));
          
       }
      
       // output the content of the linked list in original order using iterator
       System.out.println("Content of LinkedList in original order");
       Iterator<Integer> o_itr=rand_list.iterator();
while(o_itr.hasNext())
{
System.out.print(o_itr.next()+" ");
}
  
// output the content of the linked list in original order using iterator
System.out.println("\n\nContent of LinkedList in reverse order");
Iterator<Integer> r_itr=rand_list.descendingIterator();
while(r_itr.hasNext())
{
System.out.print(r_itr.next()+" ");
}

   }

}

Code Snippets

Sample Output