Multithreading

Multithreading is simply the synchronous execution, or concurrent execution, of two or more parts of a program, and it is a fundamental aspect of Java’s concurrent programming mechanism. We execute multiple parts of our programs, taking advantage of multi-core Central Processing Unit (CPU) resources to optimize the performance of our applications.

Before we get too far into multithreads, let’s focus on a single thread. In Java, a thread is a finite unit of execution within a method, function, or process. The Java Virtual Machine (JVM) handles the management of our threads. As you can see in the following code snippet, we extend the Thread class to create and start threads:

class MyThread extends Thread {
    public void run() {
        System.out.println("Thread executed by extending Thread 
        class.");
    }
}
/...