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Socket (TCP & UDP) communication in Java

Socket communication in Java enables communication between two endpoints over a network. There are two main types of sockets: TCP sockets and UDP sockets. Let's explain both types with examples: TCP Socket Communication: 1. **Server Side**:    - The server creates a `ServerSocket` object to listen for incoming connections on a specific port.    - When a client connects, the server accepts the connection and creates a `Socket` object to communicate with the client.    - The server reads from and writes to the socket's input and output streams to communicate with the client. import java.io.*; import java.net.*; public class TCPServer {     public static void main(String[] args) throws IOException {         ServerSocket serverSocket = new ServerSocket(12345);         System.out.println("Server started. Waiting for client...");         Socket clientSocket = serverSocket.accept();   ...
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Procedure to Run the program with different class name and file name in java.

If your Java file is named `hw.java` and the public class inside it is named `HelloWorld`, you can still compile and run it. Here's how you can do it:

1. Compile the Java File:


   javac hw.java


   This will generate a `HelloWorld.class` file.


2. Run the Program:


   To run the compiled Java program, use the `java` command followed by the public class name `HelloWorld`:


   java HelloWorld


This approach works because Java uses the public class name to determine the entry point for execution, not the filename. So even though the filename (`hw.java`) doesn't match the public class name (`HelloWorld`), you can still run the program using the public class name.


OR 


you can directly run the program with the following command 

            java hw.java 

It will compile and run the program in one hit. 

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