视频https://www.bilibili.com/video/BV1E8411e718

package com.horse;

import java.util.Arrays;

public class Sort {
    public static void main(String[] args) {
        int arr[] = {4, 1, 8, 2};
        System.out.println(Arrays.toString(arr));//打印排序前数组
        bubbleSort(arr);
        System.out.println(Arrays.toString(arr));//打印排序后数组
    }

    public static void bubbleSort(int arr[]) {
        for (int i = 0; i < arr.length - 1; i++) {
            for (int j = 0; j < arr.length - 1 - i; j++) {
                if (arr[j] < arr[j + 1]) {//比较大小，对换位置操作
                    int temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                }
            }
        }
    }
}