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#Upcast and downcast in java generator
Large data Data Generator for testing, validate Email. TEST CASE, TEST PLAN and RTM(Requirement Tractabil. Tags :- Upcasting and downcasting in java, Example of upcasting in java with example, example of downcating in java with example Main use of downcasting is that we can access child class method too from single object.Įxample :In this example by single object we will access both parent child class method : ("i am inside child class") ĭowncasting : Downcasting is to put the child class object reference ID back into child class object by using the parent class referene variable. Important:If parent class and child class both have same method name means Child class is overriding the parent class method then child class method will be called.Įxample : This is again above example here method name is same in both child and parent but Now only child class method will be called. Output : Exception in thread "main" : Unresolved compilation problem: Note : Vice-versa is not possible, means by this object we can not access method of child class : Variable of parent class to access the method of parent class : Variable of parent class then it is known as Upcasting :Įxample : In below example we have passed Reference ID of child class object into reference 
Upcasting: When we put the Reference ID of child class object into reference Upcasting and Downcasting in Java with example The object being stored in o is actually a string, and therefore we can cast to a string without any problems. This process is called casting a variable.Ĭasting means it is telling the compiler that an object of type A is actually of more specific type B, and thus gaining access to all the methods on B that you would not have had otherwise. All casting really means is taking an Object of an particular type and "turning it into" another Object Type.
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