Bubble Sort Sample with Comments

BubbleSortExample.java

package com.company;

import java.util.Arrays;

public class BubbleSortExample {

    public static void main(String[] args) {
        int[] list = {34, 203, 3, 746, 200, 984, 198, 764, 9}; // list of numbers, aka: array

        bubbleSort(list);
        
        System.out.println(Arrays.toString(list));
    }

    public static void bubbleSort(int[] numArray) {
        int n = numArray.length; // list/array size
        int temp = 0; // temporary variable

        for (int i = 0; i < n; i++) { //for each item in the list/array
            for (int j = 1; j < (n - i); j++) { // for every other item (except the current one)
                int currentItem = numArray[j - 1];
                int nextInnerItem = numArray[j];
                if (currentItem > nextInnerItem) { // compare if current item is greater than inner item
                    // if "yes"/true

                    temp = currentItem;
                    numArray[j - 1] = numArray[j]; // move next item to current item's position
                    numArray[j] = temp; // move current item to next item's position
                }

            }
        }
    }
}