java多线程

1. 继承Thread类

package com.sja.corelesson;

public class ThreadDemo2 {
public static void main(String[] args) {

MyThread myThread = new MyThread();
myThread.start();
//主线程死循环  一个线程里代码按顺序执行
for (;;) {
System.out.println("world");
}
}
}
/**
* MyThread继承Thread
* @author sunjianan
*
*/
class MyThread extends Thread {
public void run() {
for (;;) {
System.out.println("hellow");
}
}
}

2. 现实Runnable接口