Multi Threading

A Thread is a lightweight sub-process
Multithreading in Java is a way of executing multiple threads simultaneously
Multithreading is used in games
It helps in the maximum utilization of CPU

Creation of Threads

Threads can be created in 2 ways. They are:

Extending to Thread class
Implementing a Runnable Interface

1. Extending Thread class

We will extend our class to java.lang.Thread
This class will override the run() method in Thread class
To start the execution of a Thread we use start() method
Threads starts their life inside run() method

Example

class Example extends Thread 
{ 
	public void run() 
	{ 
		try
		{ 
      System.out.println("current thread is " + Thread.currentThread().getId());
		} 
		catch (Exception e) 
		{ 
			System.out.println ("Exception"); 
		} 
	} 
} 

public class Main 
{ 
	public static void main(String[] args) 
	{ 
		int n = 5; 
		for (int i=0; i<n; i++) 
		{ 
			Example ob = new Example(); 
			ob.start(); 
		} 
	} 
}

check output here

2. Implementing to a Runnable Interface

We will create a class that implements the java.lang.Runnable interface

Example

class Example implements Runnable 
{ 
	public void run() 
	{ 
		try
		{ 
      System.out.println("current thread is " + Thread.currentThread().getId());
		} 
		catch (Exception e) 
		{ 
			System.out.println ("Exception"); 
		} 
	} 
} 

public class Main 
{ 
	public static void main(String[] args) 
	{ 
		int n = 5; 
		for (int i=0; i<n; i++) 
		{ 
			Thread ob = new Thread(new Example()); 
			ob.start(); 
		} 
	} 
}