How can you achieve multithreading in Java?  Question 11Answera.By defining multiple main() methods.  b.By using the multithread keyword.  c.By extending the Multithread class.  d.By defining multiple threads and running them concurrently.

In Java, multithreading can be achieved by defining multiple threads and running them concurrently. Here are the steps to do it:

1. Define a Thread: You can define a thread by either implementing the Runnable interface or by extending the Thread class.

2. Implementing Runnable Interface: Create a new class that implements the Runnable interface. Then, override the run() method in your class where you will put the logic of your thread.

class MyRunnable implements Runnable {
    public void run() {
        // Thread logic here
    }
}

3. Extending Thread Class: Create a new class that extends the Thread class. Then, override the run() method in your class where you will put the logic of your thread.

class MyThread extends Thread {
    public void run() {
        // Thread logic here
    }
}

4. Create Thread: After defining your thread, you can create a new instance of it.

MyRunnable myRunnable = new MyRunnable();
Thread thread = new Thread(myRunnable);

or

MyThread myThread = new MyThread();

5. Start Thread: You can start your thread by calling the start() method on your thread instance.

thread.start();

or

myThread.start();

Remember, calling the run() method directly will not start a new thread but it will run the method in the current running thread.

6. Run Multiple Threads: You can run multiple threads at the same time by creating multiple instances of your thread and calling start() method on them.

MyThread myThread1 = new MyThread();
MyThread myThread2 = new MyThread();
myThread1.start();
myThread2.start();

This is how you can achieve multithreading in Java.