01_线程的创建和启动

public class MyThread extends Thread {
 
private int count=0;
@Override
public void run()
{
System.out.println("线程已启动");
while(count<10000) {
count++;
}
System.out.println("count:"+count);
}
}
 

public class TestMyThread {
/*
* 继承Thread类创建线程
* 1、继承Thread类
* 2、重写run方法
* 3、实例化线程对象
* 4、调用start方法启动线程
*
* 继承Thread类会存在什么问题？
* 线程类不能继承其他类
*/
public static void main(String[] args)
{
//实例化线程对象
Thread myThread=new MyThread();
//启动线程
myThread.start();
/*
* start方法的作用：该方法会使操作系统初始化一个新的线程，由这个新的线程来执行线程对象的run方法
*/
}
}

public class MyRunnable implements Runnable {
private int count=0;
@Override
public void run() {
count++;
System.out.println("count:"+count);
}
}

public class TestMyRunnable {
 
public static void main(String[] args) {
// TODO Auto-generated method stub
Runnable my=new MyRunnable();
 
System.out.println("thread启动了");
Thread thread=new Thread(my);
 
System.out.println("thread2启动了");
Thread thread_2=new Thread(my);
thread.start();
thread_2.start();
}
 
}