Multi-Threading in JAVA

[[Threads]] can be created by using two mechanisms in java

1. Extending the Thread class

2. Implementing the Runnable Interface

the import package for thread class in java is java.lang.Thread

This class overrides the run() method available in the thread class. A thread begins its life inside run() method.

We create an object of our new class and call start() method to start the execution of a thread. Start() invokes the run() method on the [[Threads]] object

Extending the Thread class

Sample code

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");
		}
	}
}

public class Multithread{
	public static void main(String[] args){
		int n = 8;
		for(int i=0;i<n;i++){
			MultithreadingDemo obj = new MultithreadingDemo();
			obj.start();
		}
	}
}

`

Implementing the Runnable Interface

Sample code

class MultithreadingDemo implements Runnable{
	public void run(){
		try{
			System.out.println("Thread " + Thread.currentthread().getId() + " is running");
		}catch(Exception e){
			System.out.println("Exception is caught");
		}
	}
}

public class Multithread{
	public static void main(String[] args){
		int n = 8;
		for(int i=0;i<n;i++){
			MultithreadingDemo obj = new MultithreadingDemo();
			obj.start();
		}
	}
}

Thread class vs Runnable Interface

-> If we extend the Thread class, our class cannot extend any other class because Java doesnt support multiple inheritance which is opposite for implementing Runnable interface to our custom classes.

-> Using runnable will give you an object that can be shared amongst multiple threads