First-non-repeating-character in string

http://www.geeksforgeeks.org/given-a-string-find-its-first-non-repeating-character/


static char firstNonRepeatedChar(String str)
{
int n = str.length();
if(n == 0) return '#';
if(n == 1) return str.charAt(0);

int hashArr[] = new int[266];
char charArr[] = new char[266];

for(int i = 0 ;  i < 266; i++)
{
hashArr[i] = 0;
}

for(int i = 0; i <  n; i++)
{
if(hashArr[str.charAt(i)]==0) charArr[i] = str.charAt(i);
hashArr[str.charAt(i)]++;
}

for(int i = 0; i < 266; i++)
{
if(hashArr[charArr[i]] == 1)
{
return charArr[i];
}
}

return '#';
}