RE: What is multithreading in Java and how can it be implemented?

I've heard about a concept called multithreading in Java, and I'm interested in understanding what it is and how it can be implemented. Can someone help?

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Multithreading in Java is a feature that allows concurrent execution of two or more parts of a program for maximum utilization of CPU. Each part of such a program is called a thread, and they are lightweight sub-processes which share a common memory area, known as the process's heap memory. Threads can exist in several states (New, Runnable, Waiting, etc.), and you can control them through several methods of the Thread class like start(), run(), sleep(), isAlive(), join(), etc. Here is a simple way to create a thread in Java: ```java // Step 1: Define a Thread class MultithreadingDemo extends Thread{ public void run(){ try{ System.out.println ("Thread "+ Thread.currentThread().getId() + " is running"); } catch (Exception e){ System.out.println ("Exception is caught"); } } } // Step 2: Using the defined Thread public class Multithread{ public static void main(String[] args){ int n = 8; // Number of threads for (int i=0; i<n; i++){ MultithreadingDemo object = new MultithreadingDemo(); object.start(); } } } ``` The `MultithreadingDemo` extends the java.lang.Thread class making it a Thread. Inside the `Multithread` class in the main method, we create an instance of `MultithreadingDemo` and start it with the `start()` call. This causes `run()` to be called in a thread separately, that prints out the thread ID. However, remember that it's recommended to implement the Runnable interface over extending the Thread class, as Java doesn't support multiple inheritances. Use Java Executor Framework for better control and management of threads; it provides thread pool management and scheduling capabilities. Using java.util.concurrent package, you can coordinate and control thread execution in concurrent Java applications. Be careful with thread synchronization and communication to avoid thread interference and memory consistency errors. If threads are not properly synchronized, it may lead to a condition called race condition.
Answered on August 15, 2023.
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