Question

Declaring an Interface (before Java 8)

Answer 1

An interface in Java is declared using the 'interface' keyword.

Step-by-step explanation:

In Java, before version 8, you declare an interface using the interface keyword. An interface is a collection of abstract methods which are declared but not defined. It is used to define a contract that a class must follow.

For example, let's say you want to create an interface called Shape that defines a method called area(). You would declare the interface as:

public interface Shape {
double area();
}

Then, you can implement this interface in a class and provide the implementation of the area() method.

Answer 2

Before Java 8, declaring an interface involved using the interface keyword, specifying method signatures without implementations, and providing a blueprint for classes to implement.

Step-by-step explanation:

In Java, an interface is a way to achieve abstraction, allowing the definition of method signatures without providing the actual implementation. Before Java 8, the process of declaring an interface involved using the interface keyword followed by the interface name. Inside the interface, methods were declared without any implementation, serving as a contract that classes implementing the interface must adhere to. For example:

public interface MyInterface {

void method1();

int method2(String param);

}

In this example, MyInterface declares two methods, method1 and method2, and any class implementing this interface must provide concrete implementations for these methods. This approach facilitates the creation of a consistent API across multiple classes.

Before Java 8, declaring an interface involved using the interface keyword and specifying method signatures without implementations.

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Complete Question

How is Interface declared before Java 8?

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