OOP Java 2024: Java Interfaces What is it? Interface and Implements in Java
Learn how to create Java interfaces and how to use implements to create abstract methods, using polymorphism and code reuse in practice. A Java course from Beginner to Advanced for only 10 reais: https://pay.kiwify.com.br/qBUKpIF
A Java interface can be understood as a way to create abstract methods, which need to be implemented (implemented in Java) within the class that uses it.
The class that uses the interface will implement its abstract methods applying the concept of Java polymorphism, code overriding, through the Java override annotation.
Thus, multiple Java classes can implement the same interface in Java, and all will need to implement and write the method, applying overriding polymorphism—that is, simply assigning the method's specific behavior to each class. Want an example?
We have two classes: the Cat class and the Dog class. Both classes have similar behaviors, such as makeSound() and move(). Using the concept of interfaces in Java, you can create a new file, an interface, that has these abstract methods.
Something like: interface Animal. Whereas within the Animal interface, there are only the abstract methods, makeSound() and move().
Now, you can go to the Dog class and implement the Animal interface, like this: class Dog implements Animal. When you do this, the IDE (IntelliJ Java, Java IntelliJ) will automatically suggest that you implement the abstract methods within the class. Something like:
interface Animal {
void makeSound();
void move();
}
After creating the interface, we can now implement the methods, similar to inheritance in Java (extends). See below that between the class and the interface, we use the keyword implements in Java.
class Dog implements Animal {
void makeSound() {
System.out.println("Woof, Woof");
}
void mover() {
System.out.println("Running like crazy");
}
}
And the same for the Cat class, such as:
class Cat implements Animal {
void makeSound() {
System.out.println("Meow");
}
void mover() {
System.out.println("Moving slowly");
}
}
This way, we can create contracts, or rather interfaces—abstract methods that should be implemented in the classes.
This gives us greater control over what the code does, who uses which interface, and increases code readability and comprehension. Code reuse also increases, maintenance becomes easier, and software updates become easier.
If you were unsure about how to use interfaces and implements in Java, now you know. Java and interfaces are easy to apply. Some people call them "java and interface" or "java and interfaces," but the meaning is the same.
In books, you might find words like "how to use a Java interface" or "how to use implements in Java."
When you see the term "implements" in Java, know that we're talking about Java and interfaces. This is a concept from Java object-oriented programming, Java OOP, or Java and OOP.
Therefore, we should use them whenever necessary to keep our Java system object-oriented (Java OOP). But you'll only be able to do this if you break the habit of sitting down and starting to code.
You need to think about what's similar about classes to understand how to use Java methods effectively, as well as which class behaviors are specific and should be implemented, for which, it would make perfect sense to create an interface in Java.
Interfaces and implements aren't something that comes naturally. Therefore, until this skill becomes second nature, your eye is trained, and your ability to solve computational, object-oriented problems develops. You need to stop and think about what you're going to code before you actually do it (write Java code).
IntelliJ and Java can help you write code faster, but they don't help you create the best possible solution.
This is the programmer's responsibility. I hope this content has helped you. Below are the Java OOP (Java Object-Oriented Programming) videos, as mentioned in the video. Access:
Java Constructors: • POO JAVA: Construtores Java como Usar? Con...
Java Access Modifiers (Java Encapsulation): • POO JAVA: Java e Encapsulamento Como Usar?...
Java Inheritance: • Curso de JAVA: Herança em Java O Que é? Co...
Java OOP Masterclass (Java Inheritance, Java Polymorphism, Java Constructors, Java Classes, Java Attributes, and Java Methods): • POO JAVA 2024: Intellij com Java e Orienta...
Practical lessons. While I'm at it, I'm offering a course on creating graphical windows in Java and registration forms using Java Swing, at a promotional price, for channel members. Access and learn more about the course: https://pay.kiwify.com.br/RXED8AQ
Java in Practice Course: https://pay.kiwify.com.br/6RjM38z
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