Increasing sockets

How does one increase the amount of sockets used in a socket? For example If I wanted to make the socket by increasing it from using 1 socket to lets say 20 sockets?

Can you show some code where you're using sockets and describe what happens when you don't have enough?

I think I found out I need something called multithreading. I want to make more then one connection to a https site.

Yup, threading will let you retrieve from several sites or pages at once. Given my home PC and network and the program I wrote, I find it useful to run maybe four at once, but more than that get in each other's way.

Try the Sun Concurrency Tutorial for a great introduction to threads. You'll want to capture the results from each thread, so you might use join() or a cool new class like Future. Work through the tutorial and see if those words make sense then.