Interfaces for Custom Authentication in Java

Create a Java program to demonstrate the use of an interface for custom authentication

The Authenticator interface declares a single method authenticate(String username, String password) that returns a boolean indicating whether the authentication is successful or not.
In the main method of the Main class, an instance of the Authenticator interface is created using a lambda expression. Inside the lambda expression, authentication logic is simulated by checking if the provided username and password match a predefined value.
The username and password are defined.
The authenticate method of the Authenticator interface is called with the provided username and password.
The result of the authentication is printed to the console.

Source Code

interface Authenticator
{
	boolean authenticate(String username, String password);
}
 
public class Main
{
	public static void main(String[] args)
	{
		Authenticator authenticator = (username, password) -> {
			// Simulate authentication logic
			return username.equals("Admin") && password.equals("Admin123");
		};
 
		String username = "Admin";
		String password = "Admin123";
 
		boolean isAuthenticated = authenticator.authenticate(username, password);
		System.out.println("Is User Authenticated? " + isAuthenticated);
	}
}

Output

Is User Authenticated? true

Interfaces for Custom Authentication in Java

Source Code

Output

Example Programs

Interface Programs in Java