functional vs marker interfaces in java

sure! in java, interfaces play a crucial role in object-oriented programming, particularly in defining contracts that classes can implement. two common types of interfaces are **functional interfaces** and **marker interfaces**. let's explore both concepts in detail.

functional interfaces

a functional interface is an interface that contains exactly one abstract method. these interfaces can be implemented using lambda expressions, method references, or anonymous classes. functional interfaces are a key component of java's functional programming capabilities introduced in java 8.

characteristics of functional interfaces:
- they contain one and only one abstract method.
- they can have multiple default or static methods.

example of a functional interface

```java
@functionalinterface
interface calculator {
int operate(int a, int b); // single abstract method

// default method
default int add(int a, int b) {
return a + b;
}

// static method
static int subtract(int a, int b) {
return a - b;
}
}

public class functionalinterfaceexample {
public static void main(string[] args) {
// using a lambda expression to implement the functional interface
calculator addition = (a, b) - a + b;

// using the functional interface

// using the default method

// using the static method
}
}
```

marker interfaces

a marker interface is an interface that does not contain any methods or fields. it serves as a tagging mechanism to indicate that a ...

#FunctionalInterface #MarkerInterface #python
Functional interfaces
Marker interfaces
Java interfaces
Type safety
Lambda expressions
Interface inheritance
Default methods
Annotations
Functional programming
Design patterns
Java 8 features
Object-oriented programming
Interface segregation
Code readability
API design