What are some examples of interfaces in Java?

What are some examples of interfaces in Java?

In Java, an interface is a reference type, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types. Here are a few examples:

1. Comparable: This interface is used to define a natural ordering for objects. Classes that implement this interface must define the compareTo method.

2. Runnable: This interface is used to create threads. It has a single method, run(), that contains the code to be executed by the thread.

3. List: This is a part of the Java Collections Framework. It defines a contract for list operations, such as adding, removing, and accessing elements.

Would you like to see code examples for any of these?

Yes, can you show me a code example for the Comparable interface?

Sure! Here's a simple example of a class that implements the Comparable interface:

class Person implements Comparable<Person> {
    String name;
    int age;

    Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    @Override
    public int compareTo(Person other) {
        return this.age - other.age; // Compare by age
    }
}

In this example, the Person class implements Comparable<Person> and defines the compareTo method to compare Person objects based on their age. Would you like to see more examples?

That's great! Can you give me an example of the Runnable interface?

Absolutely! Here's an example of a class that implements the Runnable interface:

class MyRunnable implements Runnable {
    @Override
    public void run() {
        System.out.println("Thread is running!");
    }
}

public class Main {
    public static void main(String[] args) {
        Thread thread = new Thread(new MyRunnable());
        thread.start(); // Start the thread
    }
}

In this example, MyRunnable implements Runnable and overrides the run method. When the thread is started, it executes the code in the run method. Would you like to explore more about interfaces?