Java MQ（Message Queue）是消息隊列的一種實現方式，它可以在分布式系統中傳遞消息，實現系統之間異步解耦。Java MQ中使用消息代理（Broker）來管理消息，消息代理會接收發送者發送的消息，并將其存儲起來，等待接收者來請求消息。

//發送者代碼
ConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");
Connection connection = factory.createConnection();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Destination destination = session.createQueue("myQueue");
MessageProducer producer = session.createProducer(destination);
TextMessage message = session.createTextMessage("Hello, World!");
producer.send(message);
session.close();
connection.close();
//接收者代碼
ConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");
Connection connection = factory.createConnection();
connection.start();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Destination destination = session.createQueue("myQueue");
MessageConsumer consumer = session.createConsumer(destination);
TextMessage message = (TextMessage) consumer.receive();
System.out.println("Received message: " + message.getText());
session.close();
connection.close();

Socket編程允許Java程序建立網絡連接，實現網絡通訊。在Socket編程中，通訊的兩端都會有一個Socket對象，它們對應于網絡上的兩個端口。Java提供了ServerSocket和Socket兩個類，分別用于服務器端和客戶端的Socket對象創建。

//服務器端代碼
ServerSocket serverSocket = new ServerSocket(8080);
System.out.println("Server started");
while (true) {
Socket clientSocket = serverSocket.accept();
System.out.println("Client connected from " + clientSocket.getInetAddress().getHostAddress());
BufferedReader reader = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
String line;
while ((line = reader.readLine()) != null) {
System.out.println("Received message: " + line);
writer.write("Received: " + line);
writer.newLine();
writer.flush();
}
reader.close();
writer.close();
clientSocket.close();
}
//客戶端代碼
Socket socket = new Socket("localhost", 8080);
System.out.println("Connected to server");
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
writer.write("Hello, Server");
writer.newLine();
writer.flush();
String response = reader.readLine();
System.out.println("Received response: " + response);
reader.close();
writer.close();
socket.close();