Runnable interface in Java 8

Runnable interface in Java 8

Here is the information on runnable interface in Java 8:

In Java, a Runnable is an object that can be executed by a thread. The Runnable interface is used to define an action that should be taken, but not necessarily concurrently with other actions.

The Runnable interface has only one method: run(), which represents the code that will be executed when the Runnable object is run. This method does not return any value.

Here are the key aspects of the Runnable interface:

Here is an example of how to use the Runnable interface in Java:

public class MyRunnable implements Runnable {
public void run() {
for (int i = 0; i < 5; i++) {
System.out.println("Hello from Thread: " + i);
}
}
public static void main(String[] args) {
MyRunnable myRunnable = new MyRunnable();
Thread thread = new Thread(myRunnable);
thread.start();
}
}

In this example, MyRunnable is a class that implements the Runnable interface. The run() method in this class contains code that will be executed when the thread starts.

When you run this program, you will see "Hello from Thread: 0", "Hello from Thread: 1", and so on until it reaches 4, because the loop in the run() method runs for five times.

The main benefit of using a Runnable is that it allows you to decouple the code that needs to be executed (the run() method) from the thread that executes that code. This can make your program more flexible and easier to maintain, as well as providing a way to execute tasks without blocking the current thread.

In addition to using the Runnable interface directly, Java provides several other ways to create and run threads:

In summary, the Runnable interface is an essential part of Java multithreading that allows you to decouple code that needs to be executed from the thread that executes it.

Runnable interface is used in Java for implementing

I'm glad you asked!

In Java, the interface keyword is used to define a blueprint of methods that must be implemented by any class that implements it. This is known as an abstract class or a pure abstract class.

An interface is similar to a contract between classes that implement it. It specifies what methods should be included and how they should behave, but does not provide an implementation for those methods. Instead, the implementing class must provide its own implementation for each method declared in the interface.

Interfaces are often used to define a common set of methods or behaviors that multiple classes can share. For example, you might have an Animal interface that specifies what methods (such as makeSound(), eat(), and sleep() ) any animal class should have. Then, you could create separate classes for different types of animals (like Dog, Cat, Bird) that implement the Animal interface.

Here are some key features of interfaces in Java:

Some common uses of interfaces include:

To create an interface in Java, you use the interface keyword followed by the name of the interface:

public interface Animal {
void makeSound();
void eat();
void sleep();
}

Then, to implement this interface, you would use the implements keyword when defining a class that implements it:

public class Dog implements Animal {
@Override
public void makeSound() {
System.out.println("Woof!");
}
@Override
public void eat() {
System.out.println("Eating dog food...");
}
@Override
public void sleep() {
System.out.println("Sleeping for a few hours...");
}
}

In summary, interfaces in Java provide a way to define a contract or protocol that multiple classes must follow, and they are used extensively in programming to achieve polymorphism, code reuse, and flexibility.