The second line of output is printed because the dog reference is an instance of the Dog class, and the Dog class implements the Animal interface. That’s the basic instanceof behavior - seeing if a reference is an instance of a particular class. The first line of output is very much expected, as the test returns true because the dog object (instance) is an instance of the Dog type: The output from my “ instanceof interface” program looks like this: the class that implements our interface If (dog instanceof Animal) ("dog is an instanceof Animal") instance of the Animal interface, so this line because of java inheritance, the dog reference is also an If (dog instanceof Dog) ("dog is an instanceof Dog") the dog reference is clearly an instance of the Dog class, Public class JavaInstanceofInterfaceExample * demonstrates how instanceof works with a Java interface. * A Java instanceof interface example that
#JAVA INTERFACE IMPLEMENTS ANOTHER INTERFACE CODE#
Here’s the source code for this Java instanceof interface example: I'll then test a dog object (which is an instance of the Dog class) against the Animal interface. In the following example, I create a Java interface named Animal, and then create a class named Dog which implements this interface.
The instanceof operator supports inheritance, which I can demonstrate through a simple “instanceof interface” example. Java instanceof FAQ: How does the Java instanceof operator work with a Java Interface?
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