Multithreading In Java


Want to learn multithreading in Java, but didn’t find a reliable source? Then, you’ve landed on the right page where we will show the best information about multithreading in Java. But, before diving into the main points, let’s discuss the term thread.

A thread is the smallest part of the process which works concurrently with the other parts. All the threads have their own path of execution which means if something wrong happens in one thread, it will not affect the execution of the other threads.

But, what does the multithreading means? Is it the process of creating threads or something else? Is it easy to do or not? There might be a lot of questions which may be popping into your mind. Therefore, we have tried to answer them all in this ultimate blog post. Here’s the information which you must know about multithreading in Java:

What is Multithreading in Java?

Multithreading in Java is a process which allows you to develop multi-threaded programs in Java. A multi-threaded program means which contains two or more threads concurrently running at the same time. Each of them handles a separate task using the available resources of your computer. It works optimally and you can expect the best performance especially when your computer has multiple CPUs. This process is crafted to achieve multitasking on your computer.

In this modern world, computers have multiple CPUs and each CPU can work on 1 thread. For instance, if your computer has 4 CPUs with hyper-threading technologies, then your code could potentially run 8 different threads at the same time. You can also improve and remove the implications by introducing multithreading to it.

Multithreading in Java:

Multithreading: Multithreading is a contextual programming technique in which the program is exploited logically into a smaller unit called as the thread and each thread are executed in parallel at the same time. It allows the machine utilization of CPU such that all the thread are loaded into the memory and the CPU is busy in executing one or more threads at a time.

Life Cycle Of a Thread In Java:

A thread goes through different stages during the process of its development. It goes through the stage where it born, started, run and then dies. The whole process completes in just a few seconds. But, how all these things work? Are there any implications during the process? Let’s get answers to these questions in the following sections given below:

  1. New Born:- It is the first stage of the thread life cycle in which the thread is executed. The thread remains in New Born stage for the smaller time. It is achieved using the start method.
  2. Runnable stage:- It is the Second stage of the thread life cycle in which the thread requires all the resources such the memory, input/output device control, File and Disk control and the other additional resources. Now it is loaded into the memory called as ready to wait for the CPU.
  3. Running stage:- In this stage, the thread requires the CPU and enters into the running stage. When the thread enters the running stage it execution stars and thread stars to perform the task once enter into the running stage the thread remains in the running stage until it’s execution is completed or resources take away from it. If the CPU taken away from it enters into the runnable stage.
  4. Block stage:- During the processing of the thread the thread needs to perform the input-output task or has to wait for some sub-resources than the execution could not be performed by the CPU. It causes the CPU to remain idle. It results in wastage of CPU time. To our comes this problem the thread took away from the memory and store in the secondary storage media. Until the resources provided to the thread or input/output task is complicated. It is called as block stage or an idle stage.
  5. Dead stage:- In this stage, the execution of the thread is terminated permanently. The thread enters into the dead stage either completing the execution and is called as natural dead or by terminating the thread without complicating is its execution. It is called an unnatural death.

How Do We can Develop a Thread?

There are two methods which you can use to create a thread. But while we are going through the process, we found one method to be easier than the other. In that method, you can develop a thread by implementing a runnable interface. Following are the steps which you can follow to develop a thread by implementing a running interface:

Step 1. First of all, you need to implement a run() method which you will get from the Runnable interface. This interface provides you with an entry point and you have to put your complete business logic inside this method. Here’s the simple syntax for the run() method:

public void run( )

Step 2. After that, you have to instantiate the thread using the constructor given below:

Thread(Runnable threadObj, String threadName);

In the above code, the “threadObj” is the instance of a class which can implement the Runnable interface and the “threadname” is the name which can be given to a new thread.

Step 3. Once the thread object is created, you just have to run it by calling the “Start()” method which executes a call to run () method. Here’s the simple syntax of the start() method:

void start();

Pitfalls of Using Multithreading in Java

There are some problems which arise during the development process of a thread in java. Sometimes, the java throws an exception during the process of multithreading in Java. But, you can solve this using the Synchronization which allows you to access objects so that no two threads can trample on each other whenever you try to access the object’s properties or resources.

Another problem that may occur during the multithreading process is race conditions. This is the situation when the output is based on some particular set of events, but with java multithreading, this is not so beneficial. This is because you can’t always depend on a particular set of events which may or may not happen according to your expectations. Lastly, I just want to tell you that this is the main problem which usually occurs during the creation process.

Life Cycle Of Thread

Life Cycle Of Thread2

Creation of the thread:-

There are two ways to create the thread.

  • By Extending the thread class
  • By Implementing the Runnable interface

By Extending the thread class:-

A thread is the predefined class of java.line package. To create the thread be defined the class that extends the thread class. Now we define the run method of the thread class.

Question:- Call the start the method to create the thread.

Creation of multiple threads:-

Multiple threads can we create such that all the thread are executed in parallel. There are two ways to create multiple threads.

  • Thread having the same run method.
  • Thread having a different run method.

The thread having the same run method:-

Multiple threads can be created such that each thread has the same run method that is all the thread perform the name task. To perform this task we define the class and define the run method in it. Now create multiple objects of the class and each object contains the same run method which is executed in parallel.


Final Thoughts:

Alright, I hope you enjoyed this article about multithreading in java and got what you were looking for. If you found this post helpful, then share it with your friends, family, and relatives who are still finding the same information. Also, if you have any doubts or questions to ask, then let me know in the comment section below so that I can help you out.



  1. Suman kumar June 9, 2018

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