This link has been bookmarked by 12 people . It was first bookmarked on 28 Mar 2007, by Mukesh Soni.
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19 Apr 10
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11 Feb 10
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28 Jan 10
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must publish an industry-standard interface that spells out in detail what methods can be invoked to make the car move
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Neither industrial group needs to know how the other group's software is implemented. In fact, each group considers its software highly proprietary and reserves the right to modify it at any time, as long as it continues to adhere to the published interface.
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an interface is a reference type, similar to a class, that can contain only constants, method signatures, and nested types. There are no method bodies. Interfaces cannot be instantiated—they can only be implemented
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by classes or extended by other interfaces
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OperateCar
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int signalTurn(Direction direction, boolean signalOn);
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Note that the method signatures have no braces and are terminated with a semicolon.
To use an interface, you write a class that implements the interface
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class OperateBMW760i
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implements OperateCar
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int signalTurn(Direction direction, boolean signalOn) {
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//code to turn BMW's LEFT turn indicator lights on //code to turn BMW's LEFT turn indicator lights off //code to turn BMW's RIGHT turn indicator lights on //code to turn BMW's RIGHT turn indicator lights off }
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utomobile manufacturers who will implement the interface. Chevrolet's implementation will be substantially different from that of Toyota, of course, but both manufacturers will adhere to the same interface
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pplication Programming Interface (API). APIs are also common in commercial software products. Typically, a company sells a software package that contains complex methods that another company wants to use in its own software product.
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While the image processing company's API is made public (to its customers), its implementation of the API is kept as a closely guarded secret—in fact, it may revise the implementation at a later date as long as it continues to implement the original interface that its customers have relied on
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The Java programming language does not permit multiple inheritance (inheritance is discussed later in this lesson), but interfaces provide an alternative.
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In Java, a class can inherit from only one class but it can implement more than one interface.
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07 Nov 09
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In the Java programming language, an interface is a reference type, similar to a class, that can contain only constants, method signatures, and nested types. There are no method bodies. Interfaces cannot be instantiated—they can only be implemented by classes or extended by other interfaces. Extension is discussed later in this lesson.
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Therefore, objects can have multiple types: the type of their own class and the types of all the interfaces that they implement.
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17 Oct 09
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11 May 09
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interface
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hey can only be implemented by classes or extended
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cannot be instantiated
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23 Mar 09
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interfaces are such contracts.
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Neither industrial group needs to know how the other group's software is implemented. In fact, each group considers its software highly proprietary and reserves the right to modify it at any time, as long as it continues to adhere to the published interface.
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In the Java programming language, an interface is a reference type, similar to a class, that can contain only constants, method signatures, and nested types
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implemented by classes or extended by other interfaces
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you write a class that implements the interface
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Application Programming Interface (API).
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In Java, a class can inherit from only one class but it can implement more than one interface. Therefore, objects can have multiple types: the type of their own class and the types of all the interfaces that they implement.
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13 Sep 08
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There are a number of situations in software engineering when it is important for disparate groups of programmers to agree to a "contract" that spells out how their software interacts. Each group should be able to write their code without any knowledge of how the other group's code is written. Generally speaking, interfaces are such contracts.
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objects can have multiple types:
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This means that if a variable is declared to be the type of an interface, its value can reference any
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object that is instantiated from any class that implements the interface.
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28 Mar 07
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Interfaces as APIs
The robotic car example shows an interface being used as an industry standard Application Programming Interface (API). APIs are also common in commercial software products. Typically, a company sells a software package that contains complex methods that another company wants to use in its own software product. An example would be a package of digital image processing methods that are sold to companies making end-user graphics programs. The image processing company writes its classes to implement an interface, which it makes public to its customers. The graphics company then invokes the image processing methods using the signatures and return types defined in the interface. While the image processing company's API is made public (to its customers), its implementation of the API is kept as a closely guarded secret—in fact, it may revise the implementation at a later date as long as it continues to implement the original interface that its customers have relied on. -
objects can have multiple types: the type of their own class and the types of all the interfaces that they implement. This means that if a variable is declared to be the type of an interface, its value can reference any object that is instantiated from any class that implements the interface.
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