Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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Dive into the depths of Java with our quiz based on "Thinking in Java, Fourth Edition" by Bruce Eckel. Test your knowledge, solidify concepts, and prepare for certification with challenging questions and insightful feedback.

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What type of array does not enforce type at runtime due to erasure?

Arrays of primitive types
Arrays of generic types
Multidimensional arrays
Ragged arrays

The correct answer is: Arrays of generic types

Generic types are not allowed in arrays because during the process of type erasure, all generic type information is removed. This means that the array will essentially become an array of objects. This is why arrays of generic types do not enforce type at runtime. On the other hand, arrays of primitive types do enforce type at runtime, as the primitive types cannot be replaced with objects. Multidimensional arrays and ragged arrays also do not affect the runtime type enforcement since they both behave in the same way as regular arrays when it comes to type checking.