JAVA : What is an interface in Java? SDET Automation Testing Interview Questions & Answers

JAVA : What is an interface in Java?

SDET Automation Testing Interview Questions & Answers

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JAVA : What is an interface in Java?

An interface in Java is a collection of abstract methods that define a set of behaviors that a class must implement.

It provides a contract or agreement between two classes that one class must fulfill the expectations of the other class.

Here's an example of an interface in Java:

public interface Animal {
void makeSound();
}

public class Dog implements Animal {
public void makeSound() {
}
}

public class Main {
public static void main(String[] args) {
Dog dog = new Dog();
}
}

This defines an interface called Animal with a single method called makeSound.

The Dog class implements the Animal interface by providing an implementation for the makeSound method.

In the main method, a Dog object is created and its makeSound method is called, producing the following output:

Copy code
The dog barks.

[sdet_automation_testing]

JAVA : What is an interface in Java?

An interface in Java is a collection of abstract methods that define a set of behaviors that a class must implement.

It provides a contract or agreement between two classes that one class must fulfill the expectations of the other class.

Here's an example of an interface in Java:

public interface Animal {
void makeSound();
}

public class Dog implements Animal {
public void makeSound() {
System.out.println("The dog barks.");
}
}

public class Main {
public static void main(String[] args) {
Dog dog = new Dog();
dog.makeSound();
}
}

This defines an interface called Animal with a single method called makeSound.

The Dog class implements the Animal interface by providing an implementation for the makeSound method.

In the main method, a Dog object is created and its makeSound method is called, producing the following output:

Copy code
The dog barks.