What are the different ways to implement multi-threading in Java?

There are several ways to implement multithreading in Java: 1. Extend the Thread class: create a subclass that extends Thread and override the run() method. Start the thread by creating an instance of the subclass and calling the start() method. 2. Implement the Runnable interface: create a class that implements the Runnable interface and implement the run() method. Create an instance of the class and pass it as a parameter to the Thread class constructor to create a thread, then call the start() method to start the thread. 3. Implement the Callable interface: create a class that implements the Callable interface and implement the call() method. Create an instance of the class and pass it as a parameter to the submit() method of the ExecutorService class to create a thread, then call the get() method to retrieve the thread’s return result. 4. Use the Executor framework: manage thread execution using a thread pool in the Executor framework. Create an instance of the ExecutorService class and call the submit() method to submit tasks, then call the shutdown() method to close the thread pool. 5. Use a thread pool: create a thread pool using the ThreadPoolExecutor class from the java.util.concurrent package, and submit tasks by calling the execute() method. 6. Use the Timer class: execute tasks on a schedule using the Timer class from java.util.Timer, create an instance of the Timer class and call the schedule() method to set a schedule for the task. These are some common ways to implement multithreading in Java, each with its own suitable scenarios and methods of use.