新手求教管道流问题！

初学JAVA有些问题不明白，求大虾指点：
public static Reader reverse(Reader src) throws IOException {
BufferedReader in = new BufferedReader(source);

PipedWriter pipeOut = new PipedWriter();
PipedReader pipeIn = new PipedReader(pipeOut);
PrintWriter out = new PrintWriter(pipeOut);

new ReverseThread(out, in).start();

return pipeIn;
}
请教此段程序的详细解析，越详细越好！