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What’s class cast exception?

Ozzzy answered on May 28, 2021 Popularity 9/10 Helpfulness 1/10

answer What’s class cast exception?

What’s class cast exception?

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lass cast excep: you are attempting to cast one class to another. 
what is the precondition to cast a class? IS A relation. 
So when we have a class extending another class. 
as long as there is IS A relation between classes you can cast. 
if reference type is parent, we can downcast it to the child reference type 
RemoteWebDriver is parent of ChromeDriver and FireFoxDriver:  // Polymorphism
RemoteWebDriver driver1 = new ChromeDriver(); // upcasting implicitly done
 FirefoxDriver driver2 = (FireFoxDriver) driver1; // downcasting 
Class cast exceptions means there is no IS A relation // downcasting
you need to have the actual object in order to have the instance.

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Contributed on May 28 2021

Ozzzy

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What’s class cast exception?

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