MultiThread

10 Aug 2024 . java .

Inherit java.lang.Thread

public class ThreadTest02 {
    public static void main(String[] args) {
        MyThread t = new MyThread();
        t.start();
        for(int i = 0; i < 1000; i++){
            System.out.println("main thread--->" + i);
        }
    }
}

class MyThread extends Thread {
    @Override
    public void run() {
        for(int i = 0; i < 1000; i++){
            System.out.println("sub thread--->" + i);
        }
    }
}

run()

t.run() is just an ordinary calling method. No new branch stack will be allocated. (This is a single thread.)

start()

t.start() starts a branch thread and open up a new stack space in the JVM. After the code task is completed, it will end in an instant.

As long as the new stack space is opened, the start() method will end. The thread started successfully and will automatically call the run() method. run() and main() are equal level.

Implement java.lang.Runnable Interface

public class ThreadTest03 {
    public static void main(String[] args) {
        Thread t = new Thread(new MyRunnable()); 
        // 启动线程
        t.start();
        
        for(int i = 0; i < 100; i++){
            System.out.println("main thread--->" + i);
        }
    }
}

class MyRunnable implements Runnable {
    @Override
    public void run() {
        for(int i = 0; i < 100; i++){
            System.out.println("sub thread--->" + i);
        }
    }
}

use Anonymous internal class

public class ThreadTest04 {
    public static void main(String[] args) {
        Thread t = new Thread(new Runnable(){
            @Override
            public void run() {
                for(int i = 0; i < 100; i++){
                    System.out.println("t thread---> " + i);
                }
            }
        });

        t.start();

        for(int i = 0; i < 100; i++){
            System.out.println("main thread---> " + i);
        }
    }
}

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