What is the Difference Between Thread.start() & Thread.run() Method

Thread.start() method (native method) of Thread class actually does the job of running the Thread.run() method in a thread. If we directly call Thread.run() method it will executed in same thread, so does not solve the purpose of creating a new thread.

In Java, the Thread.start() and Thread.run() methods are related to the execution of threads, but they serve different purposes.

1. Thread.start():
   • Invoking the start() method on a Thread object is used to begin the execution of a new thread of control.
   • When start() is called, it internally calls the run() method on the new thread.
   • The actual work of the thread should be defined in the run() method.

   Example:

   java

   Thread myThread = new MyThread();
myThread.start();

2. Thread.run():
   • The run() method is the entry point for the code that will be executed in the new thread.
   • If you call the run() method directly, it will be executed in the context of the current thread, not as a separate thread.
   • It’s the method where you put the code that you want to be executed in the new thread when start() is called.

   Example:

   java

   Thread myThread = new MyThread();
myThread.run(); // This will not create a new thread


In summary, start() is used to initiate the execution of a new thread, and it internally calls the run() method of that thread. Calling run() directly will not create a new thread; it will execute the code in the context of the current thread. Typically, you should use start() to launch a new thread and let it execute its run() method independently.