What are the different ways to create threads in Java?

In Java, there are several ways to create threads.

1. Inherit the Thread class: Create a subclass that inherits from the Thread class and override the run() method to define the logic for the thread’s execution. Then start the thread by creating an instance of the subclass.
2. Implementing the Runnable interface involves creating a class that implements the Runnable interface and its run() method. Instantiating the class object and passing it as a parameter to the Thread class constructor creates a thread object. Finally, calling the start() method on the thread object starts the thread.
3. To use Callable and Future: create a class that implements the Callable interface and define the call() method. Then create an ExecutorService thread pool, submit the Callable task using the submit() method, and retrieve a Future object. The result of the thread’s execution can be obtained by calling the get() method on the Future object.
4. To utilize a thread pool: create a class that implements the Runnable interface or Callable interface, and implement the run() or call() method. Then create a thread pool object and submit tasks by calling its execute() method (or submit() method). The thread pool will automatically manage the lifecycle of threads, including creation, execution, and destruction.
5. To use a timer, create a subclass of TimerTask and override the run() method. Then create a Timer object and use its schedule() method to start the task at a specified time.
6. Utilizing thread pool frameworks (Executor, ExecutorService, ScheduledExecutorService): Creating and managing threads through the methods provided by thread pool frameworks like Executor, ExecutorService, and ScheduledExecutorService. This method allows for better control over the number of threads and resource usage.