Possible Duplicate:
Java Interfaces?
What is the use of interface in java? Is interface helps to provide multiple inheritance actually?
Possible Duplicate: Java Interfaces? What is the use of interface in java? Is interface
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Possible Duplicate:
Java Interfaces?
What is the use of interface in java? Is interface helps to provide multiple inheritance actually?
Interfaces are used as a contract.
If an Object implements an interface, it is guaranteed to offer the functionality specified in the interface.
Interfaces also allow you to treat Objects (that implement the interface) polymorphicly.