functional vs marker interfaces in java

What is functional vs marker interface in java ?
In Java, an interface is a reference type that can contain only constants, method signatures, default methods, static methods, and nested types. There are special kinds of interfaces in Java known as marker interfaces and functional interfaces.


A marker interface is an empty interface without any fields or methods, used to signal to the JVM or frameworks that an object of this class will have some special behavior.

A functional interface, introduced in Java 8, is an interface that contains exactly one abstract method and is used as the basis for lambda expressions in functional programming.

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2. Key Points
1. Marker interfaces do not contain any methods or fields and serve as a type to convey metadata about a class.

2. Functional interfaces contain a single abstract method and can have multiple default or static methods.

3. Marker interfaces are used to indicate a signal or a marker, such as Serializable in Java, which tells the JVM that the class can be serialized.

4. Functional interfaces are used to facilitate lambda expressions for functional programming in Java.
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