Java uses the start() function of the Thread class to start a new thread

Java uses the start() function of the Thread class to start a new thread

In Java, multi-threading is a concurrent execution method that can execute multiple tasks at the same time. In order to implement multi-threading, the Thread class is provided in Java, through which threads are created and controlled. Among them, the start() function is used to start a new thread.

The start() function is to put the thread into the ready state and automatically call the thread's run() method. When a thread calls the start() function, a new thread will be created and the code of the run() method will be executed in the new thread. We can define the execution logic of the thread by overriding the run() method.

The following is a sample code that demonstrates how to use the start() function of the Thread class to start a new thread:

public class MyThread extends Thread {
    @Override
    public void run() {
        // 线程的执行逻辑
        for (int i = 0; i < 5; i++) {
            System.out.println("线程执行，i = " + i);
        }
    }
}

public class Main {
    public static void main(String[] args) {
        // 创建线程对象
        MyThread thread = new MyThread();

        // 启动线程
        thread.start();

        // 主线程的执行逻辑
        for (int i = 0; i < 5; i++) {
            System.out.println("主线程执行，i = " + i);
        }
    }
}

In the above example, we first define a thread that inherits from Thread The MyThread class of the class rewrites the run() method, and defines the execution logic of the thread in the run() method. Then, we create a MyThread object in the main thread and call the start() function to start a new thread. In the main thread, we also have our own execution logic.

When we run the above code, the execution results of the main thread and the new thread will be output at the same time. It can be seen that the main thread and the new thread are executed concurrently, and their execution order is random and depends on the scheduling of the CPU.

It should be noted that once a thread is started through the start() function, the same thread cannot be started by calling the start() function again. If you need to start the same thread again, you need to recreate a thread object.

Through the start() function of the Thread class, we can easily create and start new threads to achieve concurrent execution of multiple threads. Reasonable use of multi-threading can improve the execution efficiency and response speed of the program, giving the program better concurrency performance.

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