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For example, in Java, any class that implements the Comparable interface has a compareTo method which either returns a negative integer, zero, or a positive integer, or throws a NullPointerException (if one or both objects are null). Similarly, in the .NET framework, any class that implements the IComparable interface has such a CompareTo method.
For example, in Java, the Comparable interface specifies a method compareTo() which implementing classes must implement. This means that a sorting method, for example, can sort a collection of any objects of types which implement the Comparable interface, without having to know anything about the inner nature of the class (except that two of ...
FACTORY« IMPLEMENTS interfaces». class-members. END FACTORY. OBJECT« IMPLEMENTS interfaces». instance-members. END OBJECT. END CLASS name. INTERFACE-ID. name« INHERITS« FROM» interfaces». members. END INTERFACE name. — Cobra class name «inherits parentclass» «implements interfaces» Tab ↹ members: interface name «inherits ...
In Java associative arrays are implemented as "maps", which are part of the Java collections framework. Since J2SE 5.0 and the introduction of generics into Java, collections can have a type specified; for example, an associative array that maps strings to strings might be specified as follows:
The Test.min function uses simple bounded quantification and does not ensure the objects are mutually comparable, in contrast with the Test.fMin function which uses F-bounded quantification. In mathematical notation, the types of the two functions are min: ∀ T, ∀ S ⊆ {compareTo: T → int}. S → S → S fMin: ∀ T ⊆ Comparable[T]. T ...
An interface in the Java programming language is an abstract type that is used to declare a behavior that classes must implement. They are similar to protocols.Interfaces are declared using the interface keyword, and may only contain method signature and constant declarations (variable declarations that are declared to be both static and final).
The problem is that GregorianCalendar does not implement Comparable < GregorianCalendar >, but instead the (better) interface Comparable < Calendar >. In Java, unlike in C#, Comparable < Calendar > is not considered a subtype of Comparable < GregorianCalendar >. Instead the type of max has to be modified: <
Java does not have an equivalent feature. Instead, generators are typically defined by providing a specialized implementation of a well-known collection or iterable interface, which will compute each element on demand. For such a generator to be used in a for each statement, it must implement interface java.lang.Iterable.