科大讯飞面试题 将整型12345转为54321（不能转为字符串）JAVA版

int i = 12345;
int backspin = 0;
        
while(i > 0){
    int tmp = i % 10;
    backspin = backspin * 10 + tmp;
    i = i / 10;
}
        
System.out.println(backspin);