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 reverse order.

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

Answer 1

import java.security.SecureRandom;
import java.util.LinkedList;
import java.util.ListIterator;

class Main {
    public static void main(String[] args) {
        SecureRandom rand = new SecureRandom(); //creates the random number object
        LinkedList<Integer> list = new LinkedList<>(); // creates the linked list
        // loop to add integers to linked list
        for(int i=0; i<25; i++){
            int number = rand.nextInt(100); //generates random integers in the 0 to 100 range
            list.add(number);               // adds number to list
        }

        ListIterator<Integer> itr = list.listIterator(list.size()); // creates ListIterator to iterate list
        System.out.println("List in reverse order:");
        // hasPrevious() returns true if the list has previous element
        while (itr.hasPrevious()) {
            System.out.println(itr.previous());
        }
      
        System.out.println("\nList in original order:");
        // hasNext() returns true if the list has next element
        while (itr.hasNext()) {
            System.out.println(itr.next());
        }
    }
}

Sample output