java创建线程的两种方法区别

public class TestThread extends Thread {  int count = 3;  public TestThread(String ThreadName) {    super(ThreadName);  }  @Override  public void run() {    for (int i = 0; i < 10; i++)      if (count > 0) {        System.out.println(Thread.currentThread().getName() + "--->" + count);        count--；      }  }  public static void main(String[] args) {    //new三个线程并启动    new TestThread("线程一").start();    new TestThread("线程二").start();    new TestThread("线程三").start();  }}