如何将string中\号替换成/号，replace好象不行！！！

Question

/**
     * 使用replaceString替换targetString中的matchString
     * @param targetString 源字符串
     * @param matchString 匹配子串
     * @param replaceString 替换字符串
     * @return 处理后的源字符串
     */
    public final static String replaceString( String targetString,
                                              String matchString,
                                              String replaceString )
    {
        String out;
        int targetLength = targetString.length();
        int replaceLength = replaceString.length();
        int matchLength = matchString.length();
        StringTokenizer st = new StringTokenizer( targetString, matchString );
        int firstIndex = targetString.indexOf( matchString );        if ( firstIndex < 0 )
        {
            // 无匹配
            out = targetString;            return out;
        }        if ( firstIndex > 0 )
        {
            out = "";
        }
        else
        {
            // 以要替换的字符串开头
            out = replaceString;
        }        while ( st.hasMoreTokens() )
        {
            out += st.nextToken() + replaceString;
        }        out = out.substring( 0, out.length() - replaceLength );        int lastIndex = targetString.lastIndexOf( matchString );        // 以要替换的字符串结尾
        if ( lastIndex == ( targetLength - matchLength ) )
        {
            out = out + replaceString;
        }        return out;
    }