A Marker Interface is an interface in Java that contains no methods or fields. It acts as a “tag” or “marker” to convey metadata to the JVM or compiler, enabling certain functionalities or behaviors in classes that implement these interfaces. An Interface that does not have any declaration inside but still enforces a mechanism is called a Marker Interface.<\/p>\n
The purpose of a marker interface is to indicate that a class possesses a specific property or capability without enforcing any method implementation.<\/p>\n
The key characteristics of marker interfaces are as follows:<\/p>\n
Some examples of Marker Interface are as follows:<\/p>\n
This interface is used to indicate that a class’s objects can be serialized (converted into a byte stream).<\/p>\n
import java.io.Serializable;\n\npublic class Employee implements Serializable {\n private int id;\n private String name;\n\n public Employee(int id, String name) {\n this.id = id;\n this.name = name;\n }\n}<\/code><\/pre>\nCloneable<\/h2>\n
This interface indicates that a class’s objects can be cloned using the clone()<\/strong> method from the Object class.<\/p>\nAlternatives to Marker Interfaces<\/h2>\n
Since Java 5, annotations have largely replaced marker interfaces for similar purposes as they offer more flexibility and metadata.<\/p>\n
In earlier versions of Java, Marker Interfaces were the only way to declare metadata about a Java class. In later versions of Java, Marker interfaces can be replaced by Annotations. Annotations allow flexible metadata capability.<\/p>\n
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Java Tutorials<\/h2>\n
Java Tutorial on this website:<\/p>\n