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Questions and Answers
One of the advantages of using generics is...
One of the advantages of using generics is...
A class is generic if it has type parameters.
A class is generic if it has type parameters.
True (A)
What types can you pass as arguments for the class type parameter when creating an instance of a generic class?
What types can you pass as arguments for the class type parameter when creating an instance of a generic class?
Reference types only
The automatic conversion of a primitive type to the corresponding wrapper type when being passed as a parameter to a generic class is called...
The automatic conversion of a primitive type to the corresponding wrapper type when being passed as a parameter to a generic class is called...
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What is used for the unspecified type when a generic class with an unconstrained type parameter is instantiated without specifying an actual type argument?
What is used for the unspecified type when a generic class with an unconstrained type parameter is instantiated without specifying an actual type argument?
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An advantage of using generic types is increased type-safety without the need to do typecasts at run time.
An advantage of using generic types is increased type-safety without the need to do typecasts at run time.
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Let Point be a generic type. How should we declare the method parameter to accept Point objects whose type parameter is the Number class or any subclass of Number?
Let Point be a generic type. How should we declare the method parameter to accept Point objects whose type parameter is the Number class or any subclass of Number?
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Study Notes
Generics Overview
- Generics enhance type problem identification at compile-time, minimizing runtime errors.
- A generic class must have type parameters to be considered as such.
Type Parameters and Instances
- For a generic class instance, only reference types can be passed as type arguments.
- When a generic class with an unconstrained type parameter is instantiated without an actual type argument, it defaults to using the Object type.
Autoboxing and Type Safety
- Autoboxing refers to the automatic conversion of primitive types to their corresponding wrapper types when passed to generic classes.
- Generics improve type safety by eliminating the need for runtime typecasts.
Method Parameters in Generics
- To define a method that accepts generic Point objects constrained to the Number class or its subclasses, the method parameter should be declared simply as
Point.
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Test your knowledge on generics with these flashcards. Each card provides insights into the advantages of generics, definitions of generic classes, and more. Perfect for anyone looking to deepen their understanding of generic programming.
