Questions and Answers
One of the advantages of using generics is...
A class is generic if it has type parameters.
True
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...
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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?
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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?
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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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