Add a character after every 10 characters in a string using subString() function

Question

Suppose the string is like this:

String msg = "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"

I want to add a character supposing 'f' after every 10 character iteration using subString function because I can't call StringBuilder class ( used it for insert or append functionality).

Well, this is some form of homework. In that case, you need to use material you learned in class. Homework questions are supposed to show your own attempt to solve the problem, and explain where you have a problem in it. — RealSkeptic, Sep 22 '16 at 12:33
why can't you use a StringBuilder, it is what it will be used anyway when your code will be compiled — Nicolas Filotto, Sep 22 '16 at 12:33
Nicolas, I'm basically writing my program in a bean file for groovy thats why I cant put StringBuilder function. — Ronaldo Killergod, Sep 22 '16 at 12:34
@RonaldoKillergod It is a duplicate of your previous question. — progyammer, Sep 22 '16 at 12:34
Your previous question is also a duplicate of some other question. Sounds like a linkedlist of posts. — progyammer, Sep 22 '16 at 12:35

score 0 · Answer 1 · answered Sep 22 '16 at 12:54

public class HelloWorld{

 public static void main(String []args){
     int i = 10;

    String msg = "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"; 
       while(i <= msg.length())
        {
           msg = msg.substring(0, i) + "f" + msg.substring(i, msg.length());
           i = i + 11; 

        }
    System.out.println(msg);
 }
}

score -1 · Answer 2 · answered Sep 22 '16 at 12:34

It may help you

public static String insertPeriodically(String text, String insert, int period)
{
StringBuilder builder = new StringBuilder(text.length() + insert.length() * (text.length()/period)+1);

int index = 0;
String prefix = "";
while (index < text.length())
{
    // Don't put the insert in the very first iteration.
    // This is easier than appending it *after* each substring
    builder.append(prefix);
    prefix = insert;
    builder.append(text.substring(index, 
        Math.min(index + period, text.length())));
    index += period;
}
return builder.toString();
}

This answer is exact copy of @JonSkeet answer in the [Putting char into a java string for each N characters](http://stackoverflow.com/questions/537174/putting-char-into-a-java-string-for-each-n-characters). — Ravikumar, Sep 22 '16 at 13:20

Add a character after every 10 characters in a string using subString() function

2 Answers2