Question

Write a Java method that should take an ArrayList as a parameter, print its element in the reverse order. The main function that calls the method is the following:

import java.util.*;

public class ReverseGen {

  public static void main(String[] args) {

    Scanner input = new Scanner(System.in);

      System.out.println("How many numbers do you want to input?");

      int num = input.nextInt();

      ArrayList<Double> d = new ArrayList<Double>(num);

      for(int i = 0 ; i < num; i++){

          System.out.print("Enter a double number: ");

          d.add(input.nextDouble());

      }

      reversePrint(d);

  }

}

Answer 1

import java.util.*;

public class ReverseGen {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("How many numbers do you want to input?");
        int num = input.nextInt();
        ArrayList<Double> d = new ArrayList<Double>(num);
        for (int i = 0; i < num; i++) {
            System.out.print("Enter a double number: ");
            d.add(input.nextDouble());
        }
        reversePrint(d);
    }

    public static void reversePrint(ArrayList<Double> list) {
        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(list.size() - i - 1));
        }
    }
}