Java · Theory

Socket Programming

← All stacks

Theory

183/270

Socket Programming

java.net covers sockets, URLs, addresses. Socket = endpoint for TCP communication.

URL/URLConnection fetch remote resources.

Always handle IOException.

Write one tiny example for Socket Programming. Compile, print one result, and say the output out loud before you type.

Use Socket Programming only when the problem needs it. Don’t force it into every program. Know one beginner trap.

Let's take this on the board with one tiny Main class — no extra files. Socket Programming — prints local machine host name and IP — basic networking API. Start from main, go line by line, and stop at each print. That output is the proof for Socket Programming.

Exam tip

Client socket needs host + port.

Example

import java.net.InetAddress;
public class Main {
  public static void main(String[] args) throws Exception {
    InetAddress local = InetAddress.getLocalHost();
    System.out.println(local.getHostName());
    System.out.println(local.getHostAddress());
  }
}

Socket Programming — prints local machine host name and IP — basic networking API.

Short notes

DefSocket Programming is a Java idea you should explain with one small example.
RuleKnow the keyword / API used for Socket Programming. Type a tiny Main and print one result.
RememberFor Socket Programming, say the output before you code.
TrapSocket Programming — only memorising the heading. No example, no trap.
Socket = endpoint
URL for resources

import java.net.InetAddress; public class Main { public static void main(String[] args) throws Exception { InetAddress local = InetAddress.getLocalHost(); System.out.println(local.getHostName()); System.out.println(local.getHostAddress()); } }

Socket Programming

Example

Short notes

Questions

Socket Programming

Example

Short notes

Questions