Base 64 encode and decode example code

Does anyone know how to decode and encode a string in Base64 using the Base64. I am using the following code, but it’s not working.

String source = "password"; 
byte[] byteArray = source.getBytes("UTF-16"); 
Base64 bs = new Base64(); 
//bs.encodeBytes(byteArray); 
System.out.println( bs.encodeBytes(byteArray)); 
//bs.decode(bs.encodeBytes(byteArray));
System.out.println(bs.decode(bs.encodeBytes(byteArray)));