求一个数字中位数最大值

public class max {
public static void main(String[] args){
    int n=1584;  
int m=  qiuzuida(n); 
    System.out.println(m);
}
public static int qiuzuida(int n)
{
int x=n;
int max=x%10;
         while(x!=0)
{
     x=x/10;
if(max