how to count special character in a string

Question

Possible Duplicate:
String Functions how to count delimiter in string line

I have a string as str = "one$two$three$four!five@six$" now how to count Total number of "$" in that string using java code.

Answer 1

Using replaceAll:

    String str = "one$two$three$four!five@six$";

    int count = str.length() - str.replaceAll("\\$","").length();

    System.out.println("Done:"+ count);

Prints:

Done:4

Using replace instead of replaceAll would be less resource intensive. I just showed it to you with replaceAll because it can search for regex patterns, and that's what I use it for the most.

Note: using replaceAll I need to escape $, but with replace there is no such need:

str.replace("$");
str.replaceAll("\\$");

Answer 2

You can just iterate over the Characters in the string:

    String str = "one$two$three$four!five@six$";
    int counter = 0;
    for (Character c: str.toCharArray()) {
        if (c.equals('$')) {
            counter++;
        }
    }

Answer 3

String s1 = "one$two$three$four!five@six$";

String s2 = s1.replace("$", "");

int result = s1.length() - s2.length();