In servlets in java. PrintWriter out=res.getWriter(). Here we didnt create obj for PrintWriter just reference.

Question

Here we didnt create any object for PrintStream just make a reference and point towards the response method getWriter.
How it possible.How it happened Any one explain.

Answer 1

You have declared as PrintStream res;
which is more than sufficient

Answer 2

The "web container" (in this case, your Java servlet container) manages all of the resources.

The HTTP request was received by the container when it accepted a socket connection and got both input and output streams from the socket.

The container's implementation of HttpResponse can return the ServletOutputStream via getOutputStream, or, in your case, calling getWriter() gets you a PrintWriter that has been stacked onto the ServletOutputStream.

So, bottom line, is that the container and its implemenation of the JEE or Servlet APIs made the instantiation for you.

Answer 3

Response.getwriter

Answer 4

outfile is not the same as outFile