Answer to Question #268025 in Java | JSP | JSF for harryy

Question

8. Groupings

by CodeChum Admin

Did you know that you can also reverse lists and group them according to your liking with proper code? Let's try it to believe it.

Instructions:

1. Create a variable that accepts a positive odd integer.
2. Create an empty list. Then, using loops, add random integer values into the list one by one. The number of values to be stored is dependent on the inputted odd integer on the first instruction.
3. Reverse the order of the list. Then, print out the list's new order in this manner:
4. [first-half values]-[middle value]-[second-half values], just like that of the sample output. Make use of list slicing that you’ve learned from the past lessons to easily achieve this segment.

Input

The first line contains an odd positive integer.

The next lines contains an integer.

5
1
3
4
5
2

Output

A line containing a list.

[2,5]-[4]-[3,1]

Answer 1

SOLUTION TO THE ABOVE QUESTION

SOLUTION CODE

package com.company;
import java.util.ArrayList;
import java.util.*;
class Main{
    public static void main(String arg[])
    {
        //propmt the user to enter a positive odd integer
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a positive odd integer: ");
        int odd_integer = sc.nextInt();

        //lets create an array of the odd integer size
        ArrayList<Integer> my_integers_array = new ArrayList<Integer>();
        //Lets put rando integers in the array
        for(int i = 0; i < odd_integer; i++)
        {
            System.out.print("Enter integer "+(i+1)+": ");
            int my_integer = sc.nextInt();
            my_integers_array.add(my_integer);
        }
        //Lets reverse the array
        ArrayList<Integer> reverse_my_integers_array = new ArrayList<Integer>();
        for(int i = 0; i<odd_integer; i++)
        {
            reverse_my_integers_array.add(my_integers_array.get(((odd_integer-i)-1)));
        }

        System.out.println("\nour original array is: "+my_integers_array);
        System.out.println("\nOur original array is: "+reverse_my_integers_array);

        //Now let us get the sublist and print them
        List <Integer> first_half = reverse_my_integers_array.subList(0, odd_integer/2);
        List <Integer> middle = reverse_my_integers_array.subList(odd_integer/2, (odd_integer/2+1));
        List <Integer> second_half = reverse_my_integers_array.subList((odd_integer/2+1), odd_integer);

        System.out.println("The sub list divided as first half, middle and second half are: \n");
        System.out.printf(String.valueOf(first_half)+"-"+String.valueOf(middle)+"-"+String.valueOf(second_half));
    }

SAMPLE PROGRAM OUTPUT