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![]() The dynamic binding of above example can be demonstrated like below. This type of binding is called dynamic binding. For “a2.method()” call, method() of actual object to which ‘a2’ is pointing will be called. For example, for “a1.method()” call in the above picture, method() of actual object to which ‘a1’ is pointing will be called. It is alsoĬalled late binding because binding happens when program actually isĭuring run time actual objects are used for binding. This type of binding is called static binding.ĭynamic binding is a binding which happens during run time. It does not check to which object, ‘a1’ and ‘a2’ are pointing. Similarly, for “a2.method()” method call, it checks whether there exist method definition for method() in Class A. It just checks the type of reference variable through which a method is called and checks whether there exist a method definition for it in that type.įor example, for “a1.method()” method call in the above picture, compiler checks whether there exist method definition for method() in Class A. ‘a2’ is also reference variable of type class A but pointing to object of Class B.ĭuring compilation, while binding, compiler does not check the type of object to which a particular reference variable is pointing. In this picture, ‘a1’ is a reference variable of type Class A pointing to object of class A. Static binding can be demonstrated like in the below picture. It isĪlso called early binding because binding happens before a program Static binding is a binding which happens during compilation. Now, come to static binding and dynamic binding in java. If compiler does not see the proper method definition for every method call, it throws error. In this picture, “a1.methodOne()” call is binding to corresponding methodOne() definition and “a1.methodTwo()” call is binding to corresponding methodTwo() definition.įor every method call there should be proper method definition. This picture clearly shows what is binding. Given these interfaces, when the print() method is called without anyĪrguments, the compiler, looking at the function arguments knows which function is meant to be called and it generates the object codeįor more details please read "What is Polymorphism" (Google it).īinding refers to the link between method call and method definition. Method overloading and method overriding using static methods method overriding using private or final methods are examples for static polymorphismĪn employee object may have two print() methods one taking noĪrguments and one taking a prefix string to be displayed along with Here, Java compiler knows which method is called. Static (compile time) polymorphism is the polymorphism exhibited at compile time. Serialize() ’ or ‘ De-serialize() ’ method are called on it,Īppropriate versions of the virtual methods are called. ![]() The ‘ Document’ class reference (or pointer) and when the ‘ Serialized/de-serialized, the document objects will be referred by When different types of documents need to be Methods in its own way based on the actual contents of the documents. ![]() Methods as virtual and each derived class will implement these XMLDocument, WordDocument, etc.ĭocument class will define ‘ Serialize() ’ and ‘ De-serialize() ’ ![]() We can have ‘Document’ as the base class and different document typeĬlasses deriving from it. Method overloading and method overriding using instance methods are the examples for dynamic polymorphism.Ĭonsider an application that serializes and de-serializes different Only JVM decides which method is called at run-time. Here, Java compiler does not understand which method is called at compilation time. Dynamic (run time) polymorphism is the polymorphism existed at run-time.
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