reddybajjuri

• Mar 26th, 2007

 

Null Interfaces also know as Marker Interfaces are simply marking the class that implements them.Now when the JVM looks at such a class it allows it to call certain methods.

e.g There is a method clone() in Object class.All classes implicitly inherit this class.So we should be able to call this method when we declare a user defined class.Try doing this and the JVM will give an error.

For this the solution is that if we implement the Clonable marker interface then JVM knows that this class can call the clone() method.So now we can call clone on this class's object.

reddybajjuri

 Profile Answers by reddybajjuri 

• Mar 26th, 2007

 

Null Interfaces also know as Marker Interfaces are simply marking the class that implements them.Now when the JVM looks at such a class it allows it to call certain methods.

e.g There is a method clone() in Object class.All classes implicitly inherit this class.So we should be able to call this method when we declare a user defined class.Try doing this and the JVM will give an error.

For this the solution is that if we implement the Clonable marker interface then JVM knows that this class can call the clone() method.So now we can call clone on this class's object.

jimmy514in

 Profile Answers by jimmy514in Questions by jimmy514in

• May 18th, 2010

 

Null Interfaces are markable interfaces.
Ex:
Cloneable
Runnable
Serializable
Externalizable.
SingleThreadModel,
Event listener