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krishna
tagged/marker interface in java
1 Answer(s)      6 years and 4 months ago
Posted in : Java Beginners



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September 15, 2008 at 12:41 PM


Hi,


Marker interface is interface which doesn't have any method but still holds information. Interfaces with no methods are called marker interfaces and they are used to tag classes. To understand how exactly this tagging is done, we need to talk about a seldom used instanceof java operator, which works in the following way: if(objectA instanceof ClassB) will yield true if objectA can be upcast to type ClassB.


This is simple code.


interface markerImp {
}

class MarkerTest implements markerImp{
}

public class TestInstanceOf {
public static void main(String []args){
MarkerTest mt = new MarkerTest();
if(mt instanceof markerImp){
System.out.println("True");
}
else{
System.out.println("False");
}
}
}


-----------------------------------------


Read for more information.

http://www.roseindia.net/java/

Thanks.

Amardeep


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