how to count the spaces in a java string?

Question

I need to count the number of spaces in my string but my code gives me a wrong number when i run it, what is wrong?

 int count=0;
    String arr[]=s.split("");
    OOPHelper.println("Number of spaces are: "+arr.length);
    count++;

Answer 1

s.length() - s.replaceAll(" ", "").length() returns you number of spaces.

There are more ways. For example"

int spaceCount = 0;
for (char c : str.toCharArray()) {
    if (c == ' ') {
         spaceCount++;
    }
}

etc., etc.

In your case you tried to split string using - TAB. You will get right result if you use " " instead. Using s may be confusing since it matches all whitepsaces - regular spaces and TABs.