Marker interface means , interface which has no methods.Then what is the necess

Marker interface means , interface which has no methods.Then
what is the necessity of its usage.I read "it tells the
compiler that it should be treated differently ". "It is
used to store state of an object". But still am not
clear.Please explain clearly.

Question Posted / prakash

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Marker interface means , interface which has no methods.Then what is the necessity of its usage.I r..

Answer / pratap jadaun

Marker interface means, interface which has no methods. Then
what is the necessity of its usage. I read "it tells the
compiler that it should be treated differently ".

but the marker interface is not only
used to store state of an object

below given list of marker interfaces

- java,lang.Cloneable
- java,io.Serializable
-java.util.EventListener
....

these are marker interfaces in java and each interface is
used for different purpose

A class implements the Cloneable interface to indicate to
the Object.clone() method that it is legal for that method
to make a field-for-field copy of instances of that class.

"Serializable is used to store state of an object".

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Marker interface means , interface which has no methods.Then what is the necessity of its usage.I r..

Answer / ras

To store the state of object

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