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POComparing elements in a list and swapping them. Java
 

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    <p>Hi I have been working on a solution for days, and I've been trying to figure it out on my own but I just can't.</p> <p>I have an ArrayList and I want to swap the elements in it. But I want to compare the list in halves. So say if the list had 8 elements in it, I would want to compare the first element in the first half of the list with the first element in the second half of the list. So list[0] with list[4] and if 4 is bigger than 0, i want to swap them, then i want to increment 0 and by 1, and half the list by one, until i = 4. I have to run it from the command line.</p> <pre><code> import java.util.Arrays; import java.util.ArrayList; import java.util.Scanner; import java.util.Collections; public class TennisTournament { public static void main (String [] args) { Scanner input = new Scanner(System.in); ArrayList &lt;Integer&gt; nums = new ArrayList&lt;Integer&gt;(); while (input.hasNextInt()) { nums.add(input.nextInt()); } tournament(nums); } public static void tournament(ArrayList &lt;Integer&gt; list) { int midPoint = list.size()/2; // returns the index number of half of the lists size for (int i = 0; i &lt; midPoint; i++) { // while is bigger than mid point, increment by one if (list.get(i) &lt; list.get(midPoint)) { Collections.swap(list, i, midPoint); System.out.print(list); } } System.out.println(list); } } </code></pre> <p>This is what I have so far, but when I run it from the command line, it just returns an ordinary list, and I'm completely stumped. I would much rather use a loop than the collections method as it is not a style of programming i am particular familiar with.</p>
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