创建线程

public class SimpleThread extends Thread{
private int countdown=5;//声明并赋值countdown=5
private int threadNumber;//声明变量threadNumber
private static int threadCount=0;//声明全局变量threadCount=0
public SimpleThread(){
threadNumber=++threadCount;//threadCount+1后再赋值给threadNumber
System.out.println("Making"+threadNumber);//打印
}
public void run(){
while(true){System.out.println("Thread"+threadNumber+"("+countdown+")");//如果为true，打印
if(--countdown==0)return;}//如果countdown-1为0，返回
}
public static void main(String[] args) {
for(int i=0;i<=5;i++)
{new SimpleThread().start();
System.out.println("All Thread started");
}
}

}

每次输出都不同。