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Chapter 17: Problem 11

In generic type notation, what does \(<\) ? super Integer>mean?

Short Answer

Expert verified
super Integer> represent in generic type notation? Answer: The notation in generic type notation represents a lower bound for a type parameter, restricting the type allowed to be a superclass of the Integer class, including the Integer class itself. It is used when you want to define a generic type that accepts Integer and any of its superclasses, such as Number or Object.

Step by step solution

01

Understanding Generic Type Notation

Generic type notation is a way to create generic (or parameterized) classes or interfaces in programming languages, like Java, by defining a type instead of a concrete class. The '<>' symbols are used to enclose the type parameter and can be used to create instances of objects with a specific type.
02

Understanding the super Keyword in Generic Type Notation

The 'super' keyword in generic type notation is used to define a lower bound for a type parameter. It restricts the type allowed to be a superclass of the specified type. In this case, the lower bound is defined as Integer class.
03

Analyzing

The notation means that the generic type can be any superclass of the Integer class, including the Integer class itself. This is useful when you want to use a generic type that allows input of Integer and any type that is a superclass of Integer, like Number or Object.

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Most popular questions from this chapter

In generic type notation, does the super key word establish an upper boundary or a lower boundary?

Assume that you must define the type parameter \(T\) in a generic method. How would you constrain the type parameter T so it only accepts type arguments that implement the Comparable interface?

During the process of erasure, when the compiler encounters a generic class, interface, or method with an unbound type parameter, such as or , what does it replace the type parameter with?

Do generic types still exist at the bytecode level?

Why would you want to constrain the type parameter in a generic class?
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