help needed regarding appending character

package learn;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class AddCharDemo {

public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("enter the string:: ");
String s = br.readLine();
int l = s.length();
StringBuffer sb = new StringBuffer(s);
for(int i = (l-1);i>=0;i--){
if(sb.charAt(i)=='a'){
sb.append('e');
}
}
System.out.println("String after addition is:: " + sb.toString());

}

}

Hi All,

I just wanted to add a char 'e' next to 'a' wherever it is found. But this program of mine will append at the end of the string. Please help.

Thanks,
Divya

use method setCharAt(int index,char ch)

Hi Thakur,

If I use setCharAt(), it is setting the desired char at that index position. But I would like to add it after the char which I have given in the if condition.

if(sb.charAt(i)=='a'){
sb.setCharAt(i, 'e');
}

you can use

Just a note, if its not a multithreaded operation, use StringBuilder instead of StringBuffer. Because StringBuffer is thread safe and will make the operation slow.

your code was so confusing, you can use below code it is very simple.

Thank you so much ...Its working fine now

You want every occurrence of 'a' to be replaced by 'ae'. Why not simply use String.replace? What am I missing?