How to implement multi-threading in Java virtual machine?

Multiple threads in the Java virtual machine allow applications to perform tasks concurrently. The thread management API provided by the JVM includes: 1. Thread: thread base class; 2. Runnable: interface for defining thread tasks; 3. Executor: an abstraction that simplifies thread pool and task management. To create a thread, use the Thread(Runnable) constructor. Start the thread using the start() method. Multithreading can be used to perform tasks in parallel, such as getting the title of a web page.

Multi-threading in Java Virtual Machine

Multi-threading is a key technology in Java programming that allows applications Execute multiple tasks concurrently. The Java Virtual Machine (JVM) implements multithreading by providing a set of thread management APIs.

Thread Management API

JVM provides several API classes to manage threads:

• Thread: represents threads base class. It provides methods to create, start and terminate threads.
• Runnable: An interface used to define the tasks to be performed by the thread.
• Executor: An abstraction that simplifies thread pool and task management.

Create a thread

To create a thread, you can use the new Thread(Runnable) constructor. This constructor creates a new thread and specifies its task as an object that implements the Runnable interface.

The following is an example of creating a thread:

class MyRunnable implements Runnable {
    @Override
    public void run() {
        System.out.println("MyRunnable 正在运行");
    }
}

public class Main {
    public static void main(String[] args) {
        Thread myThread = new Thread(new MyRunnable());
        myThread.start();
    }
}

Thread execution

Use the start() method to start the thread. It instructs the JVM to start executing the thread's tasks.

Practical Case

The following is a practical case using multi-threading to obtain the title of a web page:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

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