JAVA 18位身份证号码校验码的算法

public static char doverify(string id)
{
char pszsrc[]=id.tochararray();
int is = 0;
int iw[]={7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
char szvercode[] = new char[]{'1','0', 'x', '9', '8', '7', '6', '5', '4', '3', '2'};
int i;
for(i=0;i<17;i++)
{
is += (int)(pszsrc[i]-'0') * iw[i];
}
int iy = is%11;
return szvercode[iy];
}