Java Note thread Mode 1 start thread

* Requirements: We want to implement multi-threaded program.
* How to achieve it?
* Because threads are dependent on processes, we should create a process first.
* and the process is created by the system, so we should go to invoke the system function to create a process.
* Java is not directly called system functions, so we have no way to directly implement multithreaded programs.
* But what? Java can go to call C + + written programs to implement multithreaded programs.
* The system function creation process is called by C + + and then by Java to invoke such things,
* Then provide some classes for us to use. We can implement multithreaded programs.
* So what are the classes provided by Java?
* Thread
* By looking at the API, we know there are 2 ways to implement multithreaded programs.
*
* Way 1: Inherit the Thread class.
* Steps
* A: Custom class Mythread inherits the thread class.
* B:mythread class inside rewrite run ()?
* Why is the run () method?
* C: Create object
* D: Start thread

What is the difference between run () and start ()?
Run (): Just encapsulate the code executed by the thread, the direct call is the normal method
Start (): Starts the thread first, and then the JVM calls the thread's run () method.

1  Public classMythreaddemo {2      Public Static voidMain (string[] args) {3         //To create a thread object4         //MyThread my = new MyThread ();5         // //Start Thread6         //My.run ();7         //My.run ();8         //Why is the call to the run () method a single thread?9         //because the run () method directly calls is actually equivalent to the normal method call, so you see the effect of a single threadTen         //To see the effects of multithreading, you must say another method: Start () One         //Interview Question: What is the difference between run () and start ()? A         //run (): Just encapsulate the code executed by the thread, the direct call is the normal method -         //start (): Starts the thread first, and then the JVM calls the thread's run () method.  -         //MyThread my = new MyThread (); the         //My.start (); -         // //illegalthreadstateexception: Illegal thread-state exception -         // //for what? Because this is equivalent to the My thread was called two times. Instead of two threads to start.  -         //My.start (); +  -         //Create two Thread objects +MyThread my1 =NewMyThread (); AMyThread My2 =NewMyThread (); at  - My1.start (); - My2.start (); -     } - } -  Public classMyThread extends Thread { in  - @Override to      Public voidrun () { +         //Write your own code -         //System.out.println ("Good study, day Up"); the         //In general, code that is executed by threads must be time-consuming. So we use loops to improve *          for(intx =0; X < $; X + +) { $System. out. println (x);Panax Notoginseng         } -     } the  +}

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Java Note thread Mode 1 start thread