Chaining stream objects allows for combining the functionality of different stream classes, a process known as filtering. For example, a FileWriter object creates an output stream to a file, and linking a BufferedWriter to it adds buffering capability. Further linking a PrintWriter provides convenient print and println methods for writing formatted text to the buffered stream.
First read the answer fully, then try to explain it in your own words. After that, open a few related questions and compare the concepts. This method helps you remember the topic for a longer time and improves exam preparation.