java multithreading -Runnable Interface

• Single inheritance has limitations, recommended Runnable interface, start the thread must borrow Thread class object

• new Thread(Run).start()

  public void run()
  {
  for(int i=0;i<5;i++)
  {
      System.out.println("aa");
  }
  }
  
  public static void main(String[]args)
  {
  ThreadDownload ra=new ThreadDownload();
  Thread it=new Thread(ra);
  it.start();
  
  //或者
  new Thread(new ThreadDownload()).start();
  
  for(int i=0;i<5;i++)
  {
      System.out.println("ff");
  }
  }