Remote 7 java. EventListener Please feel free to add if i missed any. Marker interface in Java is interfaces with no field or methods or in simple word empty interface in java is called marker interface. Example of market interface is Serializable, Clonnable and Remote interface.
Now if marker interface doesn't have any field or method or behavior they why would Java needs it? This was asked to my friend in one of his core java interview and then I thought to touch based on it.
In this article we will see couple of reason on what marker interface do in Java and what is use of marker interface in Java. Marker interface are also called tag interface in Java. Same is true for RMI and Remote interface. No Vote. No Up Vote. Suresh 30 Aug To answer why we use Marker Interface.. I found below link helpful, check once.
Rabi 23 Jul in newer version of java, there is no place or no use of marker inferface. Birender 23 Jul Marker interface is utilized to pass on to the JVM that the class actualizing an interface of that classification will have some extraordinary conduct.
Marker interface in Java is interfaces with no field or techniques or in basic word void interface in java is called marker interface. Sahil 20 Jul Marker interface is used to convey to the JVM that the class implementing an interface of that category will have some special behavior. It is an interface which does not have any method. However Annotation can be used also.
It does not have any fields or methods in it. Four major marker interfaces are Searilizable interface , cloneable interface , remote interface , threadsafe interface. Akshay 07 Jul The main purpose is to tell the compiler that treat differently for the object of the class which implemented marker interface.
Looking carefully on marker interface in java eg. I know what is marker interface - An interface with no methods. Example: Serializable, Remote, Cloneable. I am wondering what is the purpose of marker inteface.
This is my understanding:- Basically it is just to identify the special objects from normal objects. Like in case of serialization , objects that need to be serialized must implement serializable interface and down the line writeObject method must be checking somewhere if it is a instance of serializable or not. As far as i think ,Thats the only purpose for which writeObject using interface.
Maruti 29 Jul Marker interface in Java is interfaces with no field or methods or in simple word empty interface in java is called marker interface. If an interface doesn't contain any method and by implementing that interface if our object will get some ability such type of interfaces are called marker interface.
Normally you define an interface to define methods that implementing classes should have. If you don't specify any methods you call the interface a marker interface, since if only marks the class as having some property. Examples of that are Serializable, Cloneable etc. Those interfaces don't define any methods themselves, but by convention and specification you have to option to implement some special methods related to them, e.
The core Java libraries would then use reflection to check whether those methods exist if a marker interface is implemented. It is more useful for developing API and in frameworks like Spring. In Java , built-in marker interfaces are the interfaces that are already present in the JDK and ready to use. There are many built-in marker interfaces some of them are:. Cleanable interface in Java is also a marker interface that belong to java. It generates replica copy of an object with different name.
We can implement the interface in the class of which class object to be cloned. It indicates the clone method of the Object class. If we do not implement the Cloneable interface in the class and invokes the clone method, it throws the ClassNotSupportedException. Note that a class that implements the Cloneable interface must override the clone method with a public method. Let's see an example. It is a marker interface in Java that is defined in the java.
If we want to make the class serializable, we must implement the Serializable interface. If a class implements the Serializable interface, we can serialize or deserialize the state of an object of that class. Serialization converting an object into byte stream is a mechanism in which object state is read from the memory and written into a file or database.
Deserialization converting byte stream into an object is the opposite of serialization means that object state reading from a file or database and written back into memory is called deserialization of object. Serialization writing can be achieved with the ObjectOutputStream class and deserialization reading can be achieved with the ObjectInputStream class.
Remote interface is a marker interface that belong to java. It marks an object as remote that can be accessed from another machine host. We must implement the Remote interface if we want to make an object as remote.
It identifies the interfaces whose methods can be invoked from a non-local JVM. Any remote object must implement the interface directly or indirectly. Apart from built-in marker interface, Java also allows us to create own marker interface. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services. Please mail your requirement at [email protected] Duration: 1 week to 2 week.
Java Training Java Tutorial. Abstract class Interface Abstract vs Interface. Package Access Modifiers Encapsulation. Next Topic Static Function in Java. So in short Marker interface indicate,signal or a command to compiler or JVM. Amrit 10 Feb It is used to convey to the JVM that the class implementing an interface of this category will have some special behavior. The marker interface can be described as a design pattern which is used by many languages to provide run-time type information about the objects.
The marker interface provides a way to associate metadata with the class where the language support is not available. Srinivas 07 Feb Marker interface are mainly used for giving some extra functinality to the our class by extending a marker interface.
Functinality will be different from marker inerface to interface. If jvm finds any user defined class was implemented any marker interface it will do some some special operation on that object I will explain this with example supose a class was implemented by Serilizable interface It is marker interface. JVM automattically serilize the object are we writing any extra code for serilizing an object. Uday 06 Feb JVM internally provide method for supporting in main method.
Ankit 05 Feb If you try to serialize an object, the Java serialization mechanism will throw an exception if your object is not an instance of Serializable. To make it an instance of Serializable, the class of the object thus has to implement the Serializable interface, even if that interface doesn't contain any method.
Just so that. Urvashi 05 Feb all the given interfaces does not show the method. Something is under the bit and we have to find that. But a marker interface does not follow that pattern. On the other side, the implementing class defines the behavior. In java we have the following major marker interfaces as under: 1 Searilizable interface 2 Cloneable interface 3 Remote interface 4 ThreadSafe interface Marker interface in Java e.
Serializable, Clonnable and Remote is used to indicate something to compiler or JVM that the class implementing any of these would have some special behavior. Hence, if the JVM sees a Class is implementing the Serializable interface it does some special operation on it and writes the state of the object into object stream. This object stream is then available to be read by another JVM. Similarly if JVM finds that a class is implementing Clonnable interface, it performs some special operation in order to support cloning.
The same theory goes for RMI and Remote interface. Dear, Marker interfaces as the name suggest are used for just an indication and they mark the class implementing that interface.
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