This is a snippet out of my code.
if (sb.toString().endsWith(pattern)) {
    String str=sb.toString();
    bw.append(str);
    bw.close();
    return sb.toString();
}
bw has been declared earlier. the necessary header files have been imported. Yet it is throwing an error saying 
Cannot resolve symbol
symbol: method append(java.lang.string)
location: java.io.BufferedWriter
any solutions?
 
    