Create a multithreaded thread class

How to create multithreaded programs ： establish Tread Subclasses of classes

java.lang.Tread class ： Is a class that describes threads , We want to implement more threaded programs , Must inherit Tread class

Implementation steps ：

1. Create a Tread Subclasses of classes ,
2. stay Tread Class Tread Class run Method , Set up thread tasks
3. Set up TRead Subclass object of class ,
4. call Tread Methods in class start Method , Start a new thread , perform run Method

void start() Causes the thread to start executing ：java The virtual machine calls the thread's run Method .

java The program belongs to preemptive scheduling , That thread has a high priority , That thread takes precedence , Same priority , Select any one to execute .

demonstration ： Create a Main Main method

public class Demo02Thread {
    //3. Set up TRead Subclass object of class ,
    public static void main(String[] args) {
        MyTread mt=new MyTread();
        //4. call Tread Methods in class start Method , Start a new thread , perform run Method 
          mt.start();
        for (int i = 0; i <20 ; i++) {
            System.out.println("main:"+i);
        }
    }

}

Create a MyThread Class inheritance Thread class

package cn.itcast.day01.Demo02;
//1. Create a Tread Subclasses of classes ,
public class MyTread extends Thread{
//2. stay Tread Class Tread Class run Method , Set up thread tasks 
    @Override
    public void run() {
        for (int i = 0; i <20 ; i++) {
            System.out.println("run:"+i);
        }
    }
}

Execution principle ：