Difference between start and run of Thread

I recently saw a question with the following code:

= "Ping" "pong"

Q: What Will be output?

I run it many times and the result is pong ping. Later, the key point was found. The thread object t called not the start () method, but the run () method. Later, I opened the breakpoint mode debug and found that the entire program has only one thread to call the run () method. After the start () method is called, the program will have one more thread. In this case, there is a cpu contention with the main thread. There may be a variety of results, but the following output method will be executed soon, so it is basically the output of "ping pong.

 

So the difference between run () and start () is:

Run () is a method defined in the Runnable interface to allow client programmers to write their own functional code in this method. There is no difference between calling a member method directly and calling a common class.

Start () indicates the start of a thread. After this method is called, an independent thread is added to the program, and then the run () method is executed.

 

Therefore, I think it is best to inherit the Thread to write a separate Thread. If it is to implement the interface, it is still necessary to call the new Thread (new YourRunnableClass () in the main Thread, it is inconvenient.