Can I use extends and implements together in Java?

Can I use extends and implements together in Java?

I'm happy to help you with that!

In Java, you can absolutely use extends and implements keywords together when defining a class. In fact, it's a common practice in object-oriented programming.

Let's break it down:

When you combine these two keywords, you're creating a class that inherits from another class (using extends) and also implements one or more interfaces (using implements).

Here's an example:

public class Animal extends Mammal implements Flyable, Swimmable {
// implementation of methods declared in the interfaces
}

In this example:

By combining these two concepts, you're creating a class that has its own unique behavior while still inheriting the properties and methods from the superclass (Mammal) and implementing specific methods declared in the interfaces (Flyable and Swimmable).

When using extends and implements together, keep in mind:

In summary: yes, you can absolutely use extends and implements together in Java. It's a powerful combination for creating classes that inherit from others while implementing specific interfaces!

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Java extends vs implements vs inherits

Java is a programming language that uses the concept of inheritance to implement polymorphism in classes and interfaces. There are three main ways to use inheritance: extends, implements, and inherits.

Extends: The extends keyword is used when a class inherits behavior from another class. This means that one class will be the parent, also known as the superclass or base class, and another class will be the child, also known as the subclass or derived class.

For example:

public class Animal {
public void sound() {
System.out.println("The animal makes a sound");
}
}
public class Dog extends Animal {
public void sound() {
System.out.println("The dog barks");
}
}

In this case, the Dog class is extending the Animal class and overriding its sound() method. The Dog class now has its own implementation of the sound() method.

Implements: The implements keyword is used when an interface inherits behavior from another interface or class. This means that one interface will be the parent, also known as the superclass or base interface, and another interface will be the child, also known as the subclass or derived interface.

For example:

public interface Printable {
public void print();
}
public interface Editable implements Printable {
public void edit();
}

In this case, the Editable interface is implementing both the Printable and its own edit() method. The Editable interface inherits the behavior of printing from the Printable interface.

Inherits: The concept of inheritance in Java is a way to inherit properties and behavior from one class to another. This means that one class will be the parent, also known as the superclass or base class, and another class will be the child, also known as the subclass or derived class.

For example:

public class Person {
public void speak() {
System.out.println("The person speaks");
}
}
public class Employee extends Person {
public void speak() {
System.out.println("The employee speaks in a formal manner");
}
}

In this case, the Employee class is inheriting behavior from the Person class and overriding its speak() method. The Employee class now has its own implementation of the speak() method.

Key differences: In summary:

In conclusion, inheritance in Java provides a way to create a hierarchical relationship between classes and interfaces. The three main ways to use inheritance are extends, implements, and inheriting properties from one class to another.

Remember: