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Hey guys in this post, we will discuss different ways of implementing Threads in Java.

Introduction

Threads allow a program to operate more efficiently by doing multiple things at the same time.

Threads can be used to perform complicated tasks in the background without interrupting the main program.

Different ways of creating Threads

There are 2 different ways to create Threads in Java.

1. By extending Thread class
2. By implementing Runnable interface

By extending Thread class

First, let’s look at the syntax of creating a Thread

public class Main extends Thread {
	public void run () {
		System.out.println("This code is running in a thread");
	}
}

In order the create Thread we need to extend a Main class with the Thread class. Once we extend the Thread class, we can able to override the run() method.

Let’s look at the complete implementation –

public class Main extends Thread {
	public static void main(String[] args) {
		Main thread = new Main();
		thread.start();
		System.out.println("This code is running outside of the thread");
	}
	public void run () {
		System.out.println("This code is running in a thread");
	}
}

Inside the main(), we call the start() method to start the Thread

Output:

This code is running in a thread
This code is running outside of the thread

By implementing Runnable interface

First, let’s look at the syntax of creating Thread

public class Main implements Runnable {
	public void run () {
		System.out.println("This code is running in a thread");
	}
}

We need to implement the Main class with a Runnable interface. Once we implement the Runnable interface, we can able to override the run() method.

Let’s look at the complete implementation –

public class Main implements Runnable {
	public static void main(String[] args) {
		Main obj = new Main();
		Thread thread = new Thread(obj);
		thread.start();
		System.out.println("This code is running outside of the thread");
	}
	public void run () {
		System.out.println("This code is running in a thread");
	}
}

Inside the main() method, we will create the Thread object using a new keyword, then on the thread object, we will call the start() method to start the Thread.

Output:

This code is running in a thread
This code is running outside of the thread