Colon sorting code implementation

package com.itheima_01;

/*
Firing sequence ：
A way of sorting , Compare the adjacent data in the data to be sorted , Put larger data behind
Operate all data in turn , Until all data requirements are sorted
*/

public class ArrayDemo {
    
    public static void main(String[] args) {
    
        // Define an array 
        int[] arr = {
    24, 69, 80, 57, 13};
        System.out.println(" Before ordering ：" + arrayToString(arr));
  /* // The first comparison  for (int i = 0; i < arr.length - 1 - 0; i++) { if (arr[i] > arr[i + 1]) { int temp = arr[i]; arr[i] = arr[i + 1]; arr[i + 1] = temp; } } System.out.println(" After the first comparison ：" + arrayToString(arr)); // The second comparison  for (int i = 0; i < arr.length - 1 - 1; i++) { if (arr[i] > arr[i + 1]) { int temp = arr[i]; arr[i] = arr[i + 1]; arr[i + 1] = temp; } } System.out.println(" After the second comparison ：" + arrayToString(arr)); // The third comparison  for (int i = 0; i < arr.length - 1 - 2; i++) { if (arr[i] > arr[i + 1]) { int temp = arr[i]; arr[i] = arr[i + 1]; arr[i + 1] = temp; } } System.out.println(" After the third comparison ：" + arrayToString(arr)); // The fourth comparison  for (int i = 0; i < arr.length - 1 - 3; i++) { if (arr[i] > arr[i + 1]) { int temp = arr[i]; arr[i] = arr[i + 1]; arr[i + 1] = temp; } } System.out.println(" After the fourth comparison ：" + arrayToString(arr)); */

        for (int x = 0 ; x <arr.length -1 ; x++) {
    
            for (int i = 0; i < arr.length - 1 - x; i++) {
    
                if (arr[i] > arr[i + 1]) {
    
                    int temp = arr[i];
                    arr[i] = arr[i + 1];
                    arr[i + 1] = temp;
                }
            }
        }
        System.out.println(" After ordering ：" + arrayToString(arr));

    }

    // The elements in the array form a string according to the specified rules ：[ Elements 1,  Elements 2, ...]
    public static String arrayToString(int[] arr) {
    
        StringBuilder sb = new StringBuilder();
        sb.append("[");
        for (int i = 0; i < arr.length; i++) {
    
            if (i == arr.length - 1) {
    
                sb.append(arr[i]);
            } else {
    
                sb.append(arr[i]).append(",");
            }
        }
        sb.append("]");
        String s = sb.toString();
        return s;
    }
}