Write code to replace
//package com.book2s; public class Main { public static void main(String[] argv) { String text = "book2s.com"; String fromText = "o"; String toText = "O"; System.out.println(replace(text, fromText, toText)); }/*from www .j a v a2 s.co m*/ public static final String replace(final String text, final String fromText, final String toText) { if (text == null || fromText == null || toText == null) { return null; } StringBuilder buf = new StringBuilder(100); int pos = 0; int pos2 = 0; while (true) { pos = text.indexOf(fromText, pos2); if (pos == 0) { buf.append(toText); pos2 = fromText.length(); } else if (pos > 0) { buf.append(text.substring(pos2, pos)); buf.append(toText); pos2 = pos + fromText.length(); } else { buf.append(text.substring(pos2)); break; } } return buf.toString(); } }