Java - Write code to replace All substring by another substring using StringBuffer

Requirements

Write code to replace All substring by another substring using StringBuffer

Demo

//package com.book2s;

public class Main {
    public static void main(String[] argv) {
        String src = "book2s.com";
        String replace = "o";
        String dest = "O";
        System.out.println(replaceAll(src, replace, dest));
    }/*ww  w  . ja v a2s .  c om*/

    public static String replaceAll(String src, String replace, String dest) {
        StringBuffer buf = new StringBuffer(src);
        String m_dest = "";

        if (dest != null) {
            m_dest = dest;
        }

        int i = 0;

        while ((i = buf.indexOf(replace, i)) != -1) {
            buf = new StringBuffer(buf.subSequence(0, i) + m_dest
                    + buf.substring(i + replace.length()));
            i += m_dest.length();
        }
        return buf.toString();
    }
}

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