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Tarik Billa

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classcastexception

java: (String[])List.toArray() gives ClassCastException

December 25, 2022 by Tarik

This is because when you use toArray() it returns an Object[], which can’t be cast to a String[] (even tho the contents are Strings) This is because the toArray method only gets a List and not List<String> as generics are a source code only thing, and not available at runtime and so it can’t determine … Read more

Categories java Tags classcastexception, java, list, toarray Leave a comment

explicit casting from super class to subclass

October 23, 2022 by Tarik

By using a cast you’re essentially telling the compiler “trust me. I’m a professional, I know what I’m doing and I know that although you can’t guarantee it, I’m telling you that this animal variable is definitely going to be a dog.” Since the animal isn’t actually a dog (it’s an animal, you could do … Read more

Categories java Tags casting, classcastexception, java Leave a comment
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Tarik Billa

Software Engineer
tarikbilla@gmail.com
+8801884414000
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