“Java Interface” Ответ

Интерфейс в Java

An interface is a special kind of class that cannot be instantiated.
 The main idea of an interface is declaring functionality. Interfaces help to 
 abstract from specific classes and emphasize the functionality. 
It makes software design more reusable and clean
Opposite to a class, an interface can extend several interfaces. 
A class can implement multiple interfaces.
coder

Java Interface

// interface
interface Animal {
  public void animalSound(); // interface method (does not have a body)
  public void run(); // interface method (does not have a body)
}
naly moslih

Интерфейс в Java

An interface can contain:

public constants;
abstract methods without an implementation (the keyword abstract is not required here);
default methods with implementation (the keyword default is required);
static methods with implementation (the keyword static is required);
private methods with implementation.
Java 9 onwards, you can include private methods in interfaces. Before Java 9 
it was not possible.
An interface can't contain fields (only constants), constructors,
 or non-public abstract methods.
The keyword abstract before a method means that the method does not have a
body, it just declares a signature.
coder

Объявление интерфейса на Java

Public abstract interface Multi{ //Interface declaration
Public abstract void multi();//method declaration
public abstract void subtract();
}
Outrageous Ostrich

Интерфейс в Java

In many cases, it is more important to know what an object can do,instead of 
how it does what it does. This is a reason why interfaces are commonly used for
declaring a type of variable.
 interface : DrawingTool : a tool can draw
 interface DrawingTool {
    void draw(Curve curve);
}
DrawingTool pencil = new Pencil();
DrawingTool brush = new Brush();
Both Pencil and brush class should implement draw method
coder

Синтаксис для интерфейсов Java

  class  ClassName [ extends SuperClassName ]
		[ implements InterfaceName1 [, Interface Name2 �] )  {
			class body 
	}
Ugly Unicorn

Ответы похожие на “Java Interface”

Смотреть популярные ответы по языку

Смотреть другие языки программирования