method invocation of interface
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Thus, whenever the Java virtual machine invokes a method from an interface reference, it must search the method table of the object's class until it finds the appropriate method. This is why invoking instance methods on interface references can be significantly slower than invoking instance methods on class references. Virtual machine implementations can attempt to be smart, of course, about how they search through a method table. For example, an implementation could save the last index at which they found the method and try there first the next time. Or an implementation could build data structures during preparation that help them search through method tables given an interface reference. Nevertheless, invoking a method given an interface reference will likely be to some extent slower than invoking a method given a class reference.
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