What is the principle of java multithreading

Basic principles: 1. Inherit the Thread class: You can create a class, inherit the Thread class and override the run() method, and define the execution logic of the thread in the run() method. Then you can create an instance of the class and call the start() method to start the thread; 2. Implement the Runnable interface: You can create a class, implement the Runnable interface and override the run() method, and define the execution of the thread in the run() method logic. You can then create an instance of this class and pass it as a parameter to the constructor of the Thread class, and then call the start() method to start the thread.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Multiple threads in Java are implemented through the java.lang.Thread class. There are two ways to create multi-threads in Java: one is to inherit the Thread class, and the other is to implement the Runnable interface.

The following are some basic principles about Java multithreading:

1, Inherit the Thread class: You can create a class, inherit the Thread class and override the run() method, and define the execution logic of the thread in the run() method. You can then create an instance of this class and call the start() method to start the thread.

class MyThread extends Thread {
    public void run() {
        // 线程执行逻辑
    }
}
public class Main {
    public static void main(String[] args) {
        MyThread myThread = new MyThread();
        myThread.start();
    }
}

2、Implement Runnable interface:Yes Create a class, implement the Runnable interface and override the run() method, and define the execution logic of the thread in the run() method. You can then create an instance of this class and pass it as a parameter to the constructor of the Thread class, and then call the start() method to start the thread.

class MyRunnable implements Runnable {
    public void run() {
        // 线程执行逻辑
    }
}
public class Main {
    public static void main(String[] args) {
        MyRunnable myRunnable = new MyRunnable();
        Thread thread = new Thread(myRunnable);
        thread.start();
    }
}

In Java, each thread has its own call stack, and threads are independent. The operating system is responsible for Java's thread scheduling. The Java thread scheduler arranges thread execution according to the thread's priority and scheduling policy.

In addition, Java also provides some thread synchronization mechanisms, such as the synchronized keyword, Lock, Condition, Semaphore, CountDownLatch, etc., to coordinate operations between multiple threads .

In general, multi-threading in Java is implemented through the Thread class and Runnable interface. Through these basic principles, multiple concurrent execution threads can be created and managed.

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