描述进程间通信的常用方式。

// 示例：Java中通过管道通信
PipedInputStream input = new PipedInputStream();
PipedOutputStream output = new PipedOutputStream(input);

// 启动线程1写数据
new Thread(() -> {
    try {
        output.write("Hello from thread 1".getBytes());
    } catch (IOException e) {
        e.printStackTrace();
    }
}).start();

// 启动线程2读数据
new Thread(() -> {
    try {
        byte[] buffer = new byte[1024];
        int len = input.read(buffer);
        System.out.println(new String(buffer, 0, len));
    } catch (IOException e) {
        e.printStackTrace();
    }
}).start();

// 示例：Java中的消息队列（JMS - ActiveMQ）
ConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");
Connection connection = factory.createConnection();
connection.start();

// 创建会话
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Queue queue = session.createQueue("test-queue");

// 生产者发送消息
MessageProducer producer = session.createProducer(queue);
TextMessage message = session.createTextMessage("Hello from Message Queue");
producer.send(message);

// 消费者接收消息
MessageConsumer consumer = session.createConsumer(queue);
TextMessage receivedMessage = (TextMessage) consumer.receive();
System.out.println(receivedMessage.getText());

// 示例：Java中的共享内存
RandomAccessFile file = new RandomAccessFile("shared_memory.dat", "rw");
FileChannel channel = file.getChannel();

// 创建共享内存区域
MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_WRITE, 0, 1024);

// 写入数据
buffer.put("Hello Shared Memory".getBytes());

// 读取数据
buffer.flip();
byte[] data = new byte[buffer.remaining()];
buffer.get(data);
System.out.println(new String(data));

// 示例：捕获信号
Signal.handle(new Signal("INT"), signal -> {
    System.out.println("Caught signal: " + signal.getName());
});

// 示例：Java中的套接字通信
ServerSocket serverSocket = new ServerSocket(8080);
Socket socket = serverSocket.accept();
InputStream input = socket.getInputStream();
byte[] buffer = new byte[1024];
int len = input.read(buffer);
System.out.println("Received: " + new String(buffer, 0, len));

// 示例：文件通信
FileWriter writer = new FileWriter("shared_file.txt");
writer.write("Hello from Process 1");
writer.close();

BufferedReader reader = new BufferedReader(new FileReader("shared_file.txt"));
System.out.println(reader.readLine());
reader.close();