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Interfaces

Java Programming


Interfaces

The interface keyword takes the abstract concept one step further. You could think of it as a “pure” abstract class. It allows the creator to establish the form for a class: method names, argument lists and return types, but no method bodies. An interface can also contain data members of primitive types, but these are implicitly static and final. An interface provides only a form, but no implementation.


 An interface says:  
“This is what all classes that implement this particular interface will look like.” Thus, any code that uses a particular interface knows what methods might be called for that interface, and that’s all. So the interface is used to establish a “protocol” between classes.


The syntax for defining an interface is similar to creating a new class:  


interface <InterfaceName>
 {    
     // constant declarations, if any 
     
     static final <data type> <variable name>  =  <value>;  
   
   // method signatures
   
     <return type> <methodName>(<parameter list>);  
}


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