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 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 that 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 that 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.
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:
- New – A new thread begins its life as soon as it’s created. It remains at this stage until the whole process comes to its initial stage. It is also known as the Born thread.
- Initial Run – Once a new thread is developed, it’s ready to be executed. After it gets started, it becomes runnable and In this stage, the thread is considered to be executing its task.
- Waiting – Sometimes, a thread goes into the stage of waiting where it allows the other thread to execute its task. It goes to the running stage back when the other thread signals the waiting thread to execute its task again.
- Terminated – Lastly, when the thread has completed its execution task, then it’s said to be terminated or dead.
How Do We can Develop a Thread?
There are two methods that 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 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 that can implement the Runnable interface and the “thread name” is the name that 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:
Pitfalls of Using Multithreading in Java
There are some problems that arise during the development process of a thread in java. Sometimes, java throws an exception during the process of multithreading in Java. But, you can solve this using 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 that may or may not happen according to your expectations. Lastly, I just want to tell you that this is the main problem that usually occurs during the creation process.
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