# Multithreaded programming in Java

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> 
> While doing multithreaded programming in Java, you would need to have the following concepts really understood and have an idea of what they do:
> 
> 1. What is thread synchronization?
>     
> 2. Handling interthread communication
>     
> 3. Handling thread deadlock
>     
> 4. Major thread operations
>     

There are 2 ways on how you can implement **multithreading** in Java:

* By extending the **Thread** class
    
* By implementing the **Runnable** class
    

Both have their pros and cons so lets dig into it and take a look at how to do it both ways.

## 1\. Extending the Thread class

```java
public class MultithreadingExample extends Thread{

  @Overrid
	public void run(){
	  for(int i=1; i<=5; i++){
			System.out.println(i);
			try{
				Thread.sleep(1000);
			}catch(InterruptedException e){}
		}
  }
}

//run it like this

public static void main(String[] args) {
	MultithreadingExample multiThreading = new MultithreadingExample();
	multiThreading.start();
}
```

---

## 2\. Implementing the Runnable

```java
public class MultithreadingExample implements Runnable{

  @Overrid
	public void run(){
	  for(int i=1; i<=5; i++){
			System.out.println(i);
			try{
				Thread.sleep(1000);
			}catch(InterruptedException e){}
		}
  }
}

//run it like this

public static void main(String[] args) {
	MultithreadingExample multiThreading = new MultithreadingExample();
	Thread thread = new Thread(multiThreading);
	thread.start();
}
```

---

Both examples will produce the same results. But if you extend the **Thread** class, the downside is that you will not be able to extend any other class. But if you implement the **Runnable** interface, then you could still extend any other class but implement multiple interfaces because Java allows that.

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Thanks for reading!