Programming Principles II: Generics
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Questions and Answers

What is the primary concern with the initial implementation of the GeneralClass?

  • It is not thread-safe.
  • It does not support multi-threading.
  • It is not compatible with older Java versions.
  • It does not provide type safety. (correct)
  • What is the purpose of type parameters in generics?

  • To improve performance.
  • To provide compile-time type checking. (correct)
  • To reduce code readability.
  • To provide runtime type checking.
  • What is the convention for naming type parameters in generics?

  • Using lowercase letters.
  • Using a descriptive word.
  • Using a single uppercase letter. (correct)
  • Using uppercase letters.
  • What is the benefit of using generics in collections?

    <p>It provides type safety.</p> Signup and view all the answers

    What is the difference between the initial and generic implementations of the GeneralClass?

    <p>The generic implementation provides type safety.</p> Signup and view all the answers

    What is the purpose of compile-time checking in generics?

    <p>To catch type-related errors early on.</p> Signup and view all the answers

    What is the primary reason for using generics in Java?

    <p>To provide type safety at compile-time</p> Signup and view all the answers

    What happens when a primitive value is assigned to a generic type in Java?

    <p>It is automatically converted to the corresponding wrapper class</p> Signup and view all the answers

    What is the benefit of using the diamond operator in Java 7 and later?

    <p>It enables the compiler to infer type arguments</p> Signup and view all the answers

    What is the consequence of using a raw type in Java, like GeneralClass gc = new GeneralClass();?

    <p>It may lead to ClassCastException at runtime</p> Signup and view all the answers

    What is the purpose of type parameters in Java generics?

    <p>To specify the type of the object being created</p> Signup and view all the answers

    What is the convention for naming type parameters in Java generics?

    <p>They should be descriptive, like 'T' for Type</p> Signup and view all the answers

    What is the primary benefit of using generics in terms of type safety?

    <p>It catches type inconsistencies during compilation</p> Signup and view all the answers

    What is the purpose of providing a type parameter in generics?

    <p>To inform the compiler to restrict the type of entry</p> Signup and view all the answers

    Why is it important to follow the convention of using single, uppercase letters for type parameter names?

    <p>It helps to distinguish type variables from class or interface names</p> Signup and view all the answers

    What is the benefit of using generics in the Java Collections API?

    <p>It provides type safety and prevents errors at runtime</p> Signup and view all the answers

    What is the significance of the 'E' type parameter in the Java Collections Framework?

    <p>It represents the Element type</p> Signup and view all the answers

    What is the result of attempting to add an incorrect type to a generics-based collection at compile-time?

    <p>A compile-time error is thrown</p> Signup and view all the answers

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