Interface (Java): Difference between revisions

Revision as of 17:57, 11 May 2020

Revision as of 03:59, 15 July 2020

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... implements ''InterfaceName''[, ''another interface'', ''another'', ...] ...

[[Class (software)|Classes]] may implement an interface. For example, :

<syntaxhighlight lang="java">

public class Lion implements Predator {

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@Override

public boolean chasePrey(Prey p) {

// Programming to chase prey p (specifically for a lion)

}

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</syntaxhighlight>

Interfaces are commonly used in the Java language for [[Callback (computer science)|callbacks]],<ref>{{cite web |last1=Mitchell |first1=John D. |date=1996-06-01 |df=mdy |url=httphttps://www.javaworldinfoworld.com/javaworldarticle/javatips2077462/jwjava-javatip10tip-10--implement-callback-routines-in-java.html |title=Java WorldTip 10: Implement callback routines in Java |work=[[JavaWorld]] |accessdate=2020-07-14}}</ref> as Java does not allow multiple inheritance of classes, nor does it allow the passing of methods (procedures) as arguments. Therefore, in order to pass a method as a parameter to a target method, current practice is to define and pass a reference to an interface as a means of supplying the signature and address of the parameter method to the target method rather than defining multiple variants of the target method to accommodate each possible calling class.

===Subinterfaces===