Java का Socket Programming

import java.net.ServerSocket;
import java.net.Socket;
public class Main {
	public static void main(String[] args) throws Exception {
		ServerSocket server = new ServerSocket(0); // OS picks a free port
		new Thread(() -> {
			try (Socket client = server.accept()) { // blocks until a client connects
				System.out.println("Client connected");
			} catch (Exception e) {}
		}).start();
		new Socket("localhost", server.getLocalPort());
		Thread.sleep(100);
		server.close();
	}
}

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import java.net.*;
public class Main {
	public static void main(String[] args) throws Exception {
		ServerSocket server = new ServerSocket(0);
		new Thread(() -> { try { server.accept(); } catch (Exception e) {} }).start();
		Socket client = new Socket("localhost", server.getLocalPort()); // TCP handshake happens here
		System.out.println("Connected: " + client.isConnected());
		client.close();
		server.close();
	}
}

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// Import java.net.* so it can be used by its short name
import java.net.*;
// Import java.io.* so it can be used by its short name
import java.io.*;
// Define the class Main
public class Main {
	// Program entry point: the JVM starts running here
	public static void main(String[] args) throws Exception {
		// Create a new ServerSocket object and store it in server
		ServerSocket server = new ServerSocket(0);
		// Create a new Thread object and store it in serverThread
		Thread serverThread = new Thread(() -> {
			// Try code that might throw an exception
			try (Socket s = server.accept()) {
				BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
				// Print a line to the console
				System.out.println("Server received: " + in.readLine());
				new PrintWriter(s.getOutputStream(), true).println("reply");
			} catch (Exception e) {}
		});
		serverThread.start();
		Socket client = new Socket("localhost", server.getLocalPort());
		new PrintWriter(client.getOutputStream(), true).println("hello");
		BufferedReader clientIn = new BufferedReader(new InputStreamReader(client.getInputStream()));
		System.out.println("Client received: " + clientIn.readLine());
		client.close();
		server.close();
	}
}

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import java.net.*;
public class Main {
	public static void main(String[] args) throws Exception {
		ServerSocket server = new ServerSocket(0);
		Runnable acceptLoop = () -> {
			try {
				for (int i = 0; i < 2; i++) {
					Socket client = server.accept();
					new Thread(() -> System.out.println("Handling a client on its own thread")).start(); // delegated, not inline
					client.close();
				}
			} catch (Exception e) {}
		};
		new Thread(acceptLoop).start();
		new Socket("localhost", server.getLocalPort()).close();
		new Socket("localhost", server.getLocalPort()).close();
		Thread.sleep(100);
		server.close();
	}
}

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import java.net.*;
public class Main {
	public static void main(String[] args) throws Exception {
		ServerSocket server = new ServerSocket(0);
		new Thread(() -> { try { server.accept().close(); } catch (Exception e) {} }).start();
		try (Socket client = new Socket("localhost", server.getLocalPort())) { // try-with-resources closes automatically
			System.out.println("Connected and will auto-close");
		}
		server.close();
	}
}

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