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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 ...
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 ...
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.
class name definition «inheriting from parentclass». «interfaces: interfaces.» method_and_field_declarations endclass. class name implementation. method_implementations endclass. interface name . members endinterface.
In older versions of Java, the comparison method was specified as an interface Comparable: interface Comparable { int compareTo ( Object o ); } The drawback of this is that the method is specified to take an argument of type Object .
Interfaces combined with aspect-oriented programming can also produce full-fledged mixins in languages that support such features, such as C# or Java. Additionally, through the use of the marker interface pattern , generic programming , and extension methods, C# 3.0 has the ability to mimic mixins.
Java supports threads since JDK 1.0. Java offers a high versatility for running threads, often called tasks. This is done by implementing a functional interface (a java.lang.Runnable interface) defining a single void no-args method as demonstrated in the following example:
The use of interfaces to allow disparate teams to collaborate raises the question of how interface changes happen in interface-based programming. The problem is that if an interface is changed, e.g. by adding a new method, old code written to implement the interface will no longer compile – and in the case of dynamically loaded or linked plugins, will either fail to load or link, or crash at ...