冒泡排序 Java 没学会；

public class ChineseRose{
    public static void main(String[]args){
        int [] arr={9,5,1,2};
        int temp = 0;
for(int i = 0 ;i arr[j + 1]) {
                temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
        }
    }
        for (int j = 0; j