Counting number of occurences of a certain chacter in string java

linuxmandrake · 04-27-2006, 10:14 PM

for example "stsigijfgigdfksssdoggog" I want my program to be able to tell me how many s are there in that string.

Vagrant · 04-27-2006, 10:44 PM

int vals[255];
int i;
for(i=0; i < 255; i++)
vals[i] = 0;

char str[100];
strcpy(str, "stsigijfgigdfksssdoggog");

for(i=0; i<strlen(str); i++)
vals[str[i]]++;

printf("s occurred %ld times", vals[115]); // ASCII 115 is 's'

jdwilder · 04-27-2006, 10:53 PM

Off the top of my head someone could do

String s=new String("stsigijfgigdfksssdoggog");
int counter;
for (int i=0;i<s.length();i++){
if (s.charAt(i)=="s")coutner++;
}

but the probably is a more efficient way. s[i] should work instead of s.charAt(i) and may be more efficient, but it really isnt the object oriented way of doing things. I also do not remember if denoting a string is ' or ".

Vagrant · 04-27-2006, 10:57 PM

Oh, I thought this was for C not java. Sorry. jdwilder's solution would work too, but I believe it would be:

String s=new String("stsigijfgigdfksssdoggog");
int counter = 0; // better to be explicit
for (int i=0;i<s.length();i++){
if (s.charAt(i)=='s')counter++;
}

linuxmandrake · 04-27-2006, 11:10 PM

thanks guys