java多线程学习

package thread;
public class ThreadTest {

public static void main(String args[])
{
//new TestThread ().start();
TestThread tt= new TestThread();//创建TestThread类的一个实例
Thread t= new Thread(tt);//创建一个Thread类的实例
t.start();//使线程进入Runnable状态
new Thread(tt).start();
int i = 100;
while(i-- > 0)
{
System.out.println("main thread is running");
}
}

}
class TestThread implements Runnable //extends Thread
{
int ticket = 100;

public void run()//线程的代码段，当执行start()时，线程从此出开始执行
{
while(ticket > 0)
{
System.out.println(Thread.currentThread().getName() +
" is running " + ticket);
ticket--;
}
}
}