I have the following code:
String Num_of_record;
String Rec_id;
Rec_id = "1,2,3,4,5"
Num_of_record = ?
* I need to find the total amount of commas in the string
and add one to it.
* In this example Rec_id should = 4 + 1
4 being the number of commas
A sample of this would be the best. I also thank all the people that are helping me overcome these stumbling blocks. Thanks :0)
Do you want to count the number of commas, or do you really want to know how many fields you have there?
Check out the docs for StringTokenizer
[code]
String Rec_id = '1,2,3,4,5';
StringTokenizer st = new StringTokenizer (rec_id, ",");
System.out.println ("There are " + st.countTokens + " in " + Rec_id);
Do you want to count the number of commas, or do you really want to know how many fields you have there?
Check out the docs for StringTokenizer
String Rec_id = '1,2,3,4,5';
StringTokenizer st = new StringTokenizer (rec_id, ",");
System.out.println ("There are " + st.countTokens + " in " + Rec_id);
sorry... clipped off the end of my comment, first time...
String st = "1,2,3,4,5";
int numCommas = 0;
// create a copy of the string
String temp = (String)st.clone();
while( temp.indexOf(',') != -1)
{
numCommas++;
temp = temp.substring(temp.indexOf(',')+1);
}
StringTokenizer is way overkill. Why would you want to make your processor index up a string into tokens when all you want to do is count some characters.
The String example is also extremely inefficient. It's ludicrous to instantiate a new String for every comma you find.
Here's an efficient example that will compile and run as-is.
class CountCommas {
static public void main(String[] s) {
if (s.length == 0) System.exit(1);
int count = 0, i1, i = 0;
while ((i1 = s[0].substring(i).indexOf(',')) != -1) {
count++;
i += ++i1;
};
System.out.println(count + " commas");
}
}
Oops. I sent my first cut of my script instead of the last. (That version's about as inefficient as the other String example someone wrote).
This example just moves the index down the existing String. No constructors at all.
class CountCommas {
static public void main(String[] s) {
if (s.length == 0) System.exit(1);
int count = 0, i = 0;
while ((i = s[0].indexOf(',', i) + 1) != 0) count++;
System.out.println(count + " commas");
}
}
class CountCommas {
static public void main(String[] s) {
if (s.length == 0) System.exit(1);
int count = 0, i = 0;
while ((i = s[0].indexOf(',', i)) != -1) count++;
System.out.println(count + " commas");
}
}
Isn't this slightly better? Removing the addition every while loop...:P
