Java URLConnection - When do I need to use the connect() method?

Question

I have a problem to understand the meaning of the connect() method in the URLConnection class. In the following code, if I use the connect() method, I get the same result if I don't use it.

Why (or when) do I need to use it?

URL u = new URL("http://example.com"); HttpURLConnection conn = (HttpURLConnection) u.openConnection(); conn.connect();//with or without it I have the same result InputStream in = conn.getInputStream(); int b; while ((b = in.read()) != -1) { System.out.write(b); }

joce · Accepted Answer · 2014-05-14 01:05:22Z

37

HttpURLConnection conn = (HttpURLConnection) u.openConnection();

only creates an Object

connect() method is invoked by conn.getInputStream();

edited May 14, 2014 at 1:05

joce

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answered May 14, 2014 at 0:44

Amanda Jiang

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Comments

Anirudha · Accepted Answer · 2014-02-19 06:18:26Z

You are not always required to explicitly call the connect method to initiate the connection.

Operations that depend on being connected, like getInputStream, getOutputStream, etc, will implicitly perform the connection, if necessary.

Here's the oracle doc link

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