method overloading and method overriding in java | polymorphism in java скачать в хорошем качестве

method overloading and method overriding in java | polymorphism in java

Polymorphism is an oops concept poly means many and morphism means forms - so many forms by method over loading and method over riding we can achieve polymorphism in java method overloading is compile time polymorphism method overriding is run time polymorphism METHOD OVERLOADING ------------------------------------------ method over loading can be achieved by changing number of parameters of method changing data type of parameter Note: we can't achieve method over loading by changing return type of method automatic promotion happens byte - short - int -long - float - double char - int when parent class and child class data types are there child class data type method will get priority if both data types are of child class then we get ambiguity error METHOD OVERRIDING ------------------------------------------ When child class is not satisfied with parent class implementation then child class can over ride parent class method whatever method parent class has by default available to child class through inheritance, if child class not satisfied with parent class implementation then child is allowed to redefine the method based on its requirements. This process is called method overriding The parent class method is called 0ver ridden method the child class method is called over riding method In overriding method resolution always takes care by JVM based on run time object and hence overriding is also considered as run time polymorphism or dynamic polymorphism or late binding. In overloading method resolution always take care by compiler based on reference type so it is called compile time polymorphism Note: In method over riding method signature should be same 00:10 method over loading by changing number of parameter 03:22 by changing data type of parameter 04:38 by changing return type of method ? 05:43 automatic promotion in method overloading 07:19 parent and child class data type 10:41 method overriding 13:12 super keyword Follow me on Instagram   / smart_engineer_youtube