Multithreading in Java – Thread Class and Runnable Interface

In this Java Multithreading tutorial, we are going to learn about multithreading in Java. First of all, we will discuss what is Java Thread, Advantages of Multithreading in Java Programming Language. Moreover, we will discuss ways to create Java thread by Implementing the Runnable Interface and by Extending Thread Class. At last, we will discuss Difference between Java Thread Class vs Runnable Interface and Stages of Life Cycle of a Thread.

So, let us start Multithreading in Java.

Multithreading in Java - A Complete Tutorial 2018

Multithreading in Java – A Complete Tutorial

1. What is Multithreading in Java?

Multithreading is a Java feature which includes the permit to simultaneous execution of at least two sections of a program for most extreme usage of CPU. Each piece of such program is known as a thread. Along these lines, threads are light-weight forms inside a procedure.

Java Multithreading can be used multiprocessing because through thread we can share memory area. Threads can’t allow memory are and save the memory and context-switching between the thread takes less time than process.

Strings can be made by utilizing two ways:

  1. Expanding the Thread class
  2. Actualizing the Runnable Interface

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i. What is a Thread in Java?

Java thread has a separate path of execution, it is the smallest unit of processing. It is a subprocess. Threads share common memory allocation, failure of one thread doesn’t affect other threads.

ii. Advantages of Multithreading in Java

  1. It allows multiple operations at once, as they are not dependent on each other, thus not blocking the user.
  2. It saves time as multiple operations are possible.
  3. They are independent thus making the functionality better.
multithreading in Java

Advantages of Multithreading in Java

2. How to Create Java Thread?

Here, we will discuss two ways in which we can create Java Thread. Let’s discuss them one by one:

  • Create thread by extending thread class
  • Java Thread Create by Implementing the Runnable Interface in Java

i. Java Thread Create by Extending Thread Class

We make a class that is an extension of the java.lang.Thread class. This class abrogates the run() strategy accessible in Java thread class. A string starts its life inside run() technique. We make a protest of our new class and call start() technique to begin the execution of a string. Start() conjures the run() technique on the thread question.

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Example –

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; // Number of threads
        for (int i=0; i<8; i++)
        {
           MultithreadingDemo object = new MultithreadingDemo();
            object.start();
        }
   }
}

Output-
Thread 8 is running
Thread 9 is running
Thread 10 is running
Thread 11 is running
Thread 12 is running
Thread 13 is running
Thread 14 is running
Thread 15 is running

ii. Java Thread Create by Implementing the Runnable Interface in Java

We make another class which actualizes java.lang. Runnable interface and supersede run() strategy. At that point, we instantiate a Thread question and call start() technique on this protest.

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Example –

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");
        }
    }
}
class Multithread
{
    public static void main(String[] args)
    {
        int n = 8; // Number of threads
        for (int i=0; i<8; i++)
        {
            Thread object = new Thread(new MultithreadingDemo());
           object.start();
        }
    }
}                                  

Output –
Thread 8 is running
Thread 9 is running
Thread 10 is running
Thread 11 is running
Thread 12 is running
Thread 13 is running
Thread 14 is running
Thread 15 is running

3. Java Thread Class vs. Runnable Interface

  1. If we extend the Thread class, our class cannot extend any other class because Java doesn’t support multiple inheritances. But, if we implement the Runnable interface, our class can still extend other base classes.
  2. We can achieve the basic functionality of a thread by extending Thread class because it provides some inbuilt methods like yield(), interrupt() etc. that are not available in the Runnable interface.

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4. Stages of Life Cycle of a Thread in Java

A thread in multithreading in Java has a predefined lifecycle which it goes under.

Following are the various stages under which it goes –

Multithreading in Java

Stages of Life Cycle of a Thread

  1. New – Also called as born thread, it is a new thread which begins its life in a new state, it remains so until it is utilized in the program.
  2. Runnable – When a newly born thread is started and it becomes runnable, it is considered to be running a task.
  3. Waiting – This state comes when one thread is performing its function and another is waiting for it to perform its function.  The waiting thread will only perform its function when the first thread signals it to do so.
  4. Timed waiting – A thread can come to this state for a limited period of time, i.e. when it goes back to the runnable stage and the time interval expires or when the event for which it was waiting occurs.
  5. Terminated (dead ) – A thread when completes its task.

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This was all in Multithreading in Java Tutorial. Hope you like our explanation.

5. Conclusion

Hence, in this Multithreading in Java, we learned about what Java multithreading, examples of multithreading in Java. In conclusion, we discussed Java thread and how to create java thread and many other things. Furthermore, if you have any query feel free to ask in a comment section.

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