What is the purpose of marker interface in Java?

A marker interface is an interface that has no methods or constants inside it. It provides run-time type information about objects, so the compiler and JVM have additional information about the object. A marker interface is also called a tagging interface.

Which of the following statements is correct about marker interface?

Marker interfaces are also known as the Tag interface. It is used to tell the JVM or compiler that the particular class has special behavior. Hence, the correct answer is option (b).

Which of the following is a marker interface in Java language?

It is an empty interface (no field or methods). Examples of marker interface are Serializable, Cloneable and Remote interface. All these interfaces are empty interfaces.

What is a marker in Java?

A marker interface in Java is an interface with no fields or methods. Put more simply, an empty interface in Java is called a marker interface. Examples of marker interfaces are the Serializable , Cloneable and Remote interfaces. These are used to indicate some information to compilers or JVMs.

What is the purpose of marker?

A marker is an ink-filled pen with a wide tip. Kids often use washable markers, while adults are usually trusted with the permanent type. Permanent markers contain ink that can’t be washed away, and they’re useful for labeling and marking things like cardboard boxes and file folders.

What is the difference between marker interface and functional interface?

A marker interface is an interface declaring no methods, a functional interface is one with only one abstract method.

What is marker interface and why do we use?

Marker interface is used as a tag that inform the Java compiler by a message so that it can add some special behavior to the class implementing it.

What is marker interface in C#?

A marker interface is just an interface that is empty. A class would implement this interface as metadata to be used for some reason. In C# you would more commonly use attributes to mark up a class for the same reasons you’d use a marker interface in other languages.

What can we use instead of marker interface?

Annotations
In modern Java, marker interfaces have no place. They can be completely replaced by Annotations, which allow for a very flexible metadata capability. If you have information about a class, and that information never changes, then annotations are a very useful way to represent it.

Why do we need marker interface?

Marker interface is used as a tag to inform a message to the Java compiler so that it can add special behaviour to the class implementing it. When a Java class is to be serialized, you should intimate the Java compiler in some way that there is a possibility of serializing this java class.

Why do you need marker interface?

What is functional interface and marker interface in Java?

Answer: In Java, a Marker interface is an interface without any methods or fields declaration, means it is an empty interface. Similarly, a Functional Interface is an interface with just one abstract method declared in it. It has only run() method declared in it.