Runnable Interface in Java - Step-by-Step Implementation

Scope of the Article → In this article, our main focus will be on runnable interfaces using Java. → Firstly, we will be discussing the introduction of java and interfaces. → Next, we will be discussing the basic definition of a runnable interface and then the uses of a runnable interface. → Next, we will be seeing more on runnable interfaces in java and implementation of runnable interfaces. → At Last we will be seeing the step-by-step implementation of runnable interfaces using java with suitable examples. Introduction Java is a high-level and object-oriented programming language, as Java supports objects and classes. Java has interfaces which are called java interfaces which means a blueprint of a class. Runnable Interface in java which is used to execute code on the concurrent thread, which is implemented by the class. We use the public void run method, run is the method name and uses void as the return type, which does not have any arguments. A runnable interface in java indicates a class where its instances can be run as threads. As we see a method named run, which is used or called when the thread is started and we write the executable code inside the method when the thread is started. The runnable interface has many uses; it can be used mostly when we want to override the run method. The runnable interface is responsible or provides some rules to be followed for expecting the code. The overall runnable interface execution can be done, firstly it creates a class and creates its objects and the thread can be started using the objects which implement the runnable interface and uses a run method in executing different yarns. Here we use different threads because this avoids the usage or creation of subclasses of threads that instantiate a thread instance and this is important not to be subclassed till it has an opinion of modifying the class behavior. Runnable interface Runnable interface in java is mainly used in networking and its programming which is network programming and multithreaded programming. It is used in network programming because a runnable interface uses threads, for each tad represents a different control flow. In java we have different packages which support different methods and different classes, this runnable interface is supported by java. lang package. Now let us see the implementation of a runnable interface, Implementing a runnable interface using java we can create a thread with the help of an object, for doing that we should use the run method.

public void run()

This method does not require any arguments and when an object a of class implements the runnable interface is responsible to create a thread. Thread can be created as follows in java,

Runnable r = new MyRunnable();
Thread t = new Thread(r);
t.start()

Here, the created thread starts and executes the code which is included in the run method. For example,

public class demo_class implements Runnable {
@override 
public void run() {
System. out.println("Content in the run method");
}

public static void main(String [] args) {
demo_class d = new demo_class();
Thread t = new Thread(d);
t.start();
System. out.println("Thread has started now");
}
}

Output:

Thread has started now
Content in the run method 

The output of the code written, we have 2 threads: main thread and the thread which is created in the demo class.

Steps for creating a runnable interface in java:

1. Create a class that helps to start the created thread class using the object and that will implement the runnable interface. 2. In the created class, thread class we write the method or function to override called run method. public void run() 3. Next, we have to create an instance that is an object for the thread class. 4. This thread has a constructor which accepts the runnable object or instances. 5. Then, pass this object as a parameter to the thread object. 6. Then, we have to use the start() method for starting the thread and executing the run method provided in the class. 7. We cannot directly call the run method for creating and starting the thread. 8. We have to start the thread using an object created in the thread class. t.start() Let us take another example,

public class demo_class1 implements Runnable {
@override 
public void run() {
System. out.println("Content in the run method and here we can say that the run method is executing");
}

public static void main(String [] args) {
demo_class d = new demo_class();
Thread t = new Thread(d);
t.start();
System. out.println("Thread has started now and this is the main thread");
}
}

Output:

Thread has started now and this is the main thread.
Content in the run method and here we can say that the run method is executing.

The output of the code written, we have 2 threads: main thread and the thread which is created in the demo class. These are the steps for creating the runnable interface using java. Now let us brief out what has been discussed in this article. Conclusion 1. The article topic "Runnable Interface in Java - Step-by-Step Implementation" is discussed in this blog which gives us special knowledge as the interface is an important topic in java. 2. Firstly, we had seen some introduction to java and interfaces. 3. Next, we had seen the basic definition of the runnable interfaces and then discussed more on it. 4. A runnable interface in java indicates a class where its instances can be run as threads. 6. Next, we discussed about the applications of runnable interfaces such as multi-threaded programming and network programming. 7. Package to be used for implementing the runnable interfaces is java.lang package. 8. At Last we discussed the step-by-step implementation of runnable interfaces using java with suitable examples for better understanding and gaining better knowledge. Hope you got some new knowledge after reading this article.