Replace character in StringBuilder [duplicate]

Answer 1

Try replacing the characters directly to the string itself.

sb.append(("blah-blah").replace('-', '_'));

Would output

blah_blah

Answer 2

If don't want to convert the StringBuilder to a String or you need to keep using it/preserve it, then you could do something like this...

for (int index = 0; index < sb.length(); index++) {
    if (sb.charAt(index) == '-') {
        sb.setCharAt(index, '/');
    }
}

If you don't care then you could do something like...

String value = sb.toString().replace("-", "/");

Answer 3

You should have searched a little bit about this.

Anyways, when starting to program in java, the best way to know what you can do with java in-built objects is to go to the javadoc of that class and there you will get to know plenty of thing.

In your case, you'll find your answer here : StringBuilder javadoc

Use replace method.

Answer 4

Try this way

StringBuilder sb = new StringBuilder();
            sb.append("01-02-2013");

            sb.replace(sb.indexOf("-"), sb.indexOf("-")+1, "/") ;
            sb.replace(sb.indexOf("-"), sb.indexOf("-")+1, "/") ;
            System.out.println(sb.toString());

Better approch is

sb.toString().replaceAll("-", "/");