Note: To implement multiple interfaces, separate them with a comma see example below.
Notes on Interfaces: Like abstract classes , interfaces cannot be used to create objects in the example above, it is not possible to create an "Animal" object in the MyMainClass Interface methods do not have a body - the body is provided by the "implement" class On implementation of an interface, you must override all of its methods Interface methods are by default abstract and public Interface attributes are by default public , static and final An interface cannot contain a constructor as it cannot be used to create objects Why And When To Use Interfaces?
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Interface in java with example programs
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. Thus, without knowing the specific type, it knows that objects of that type can somehow be sorted. Interfaces are defined with the following syntax compare to Java's class definition :.
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The body of the interface contains abstract methods , but since all methods in an interface are, by definition, abstract, the abstract keyword is not required. Since the interface specifies a set of exposed behaviors, all methods are implicitly public. The member type declarations in an interface are implicitly static, final and public, but otherwise they can be any type of class or interface.
Classes may implement an interface.
Interface | Definition of Interface by Merriam-Webster
For example,. If a class implements an interface and does not implement all its methods, it must be marked as abstract. If a class is abstract, one of its subclasses is expected to implement its unimplemented methods, though if any of the abstract class' subclasses do not implement all interface methods, the subclass itself must be marked again as abstract. Interfaces are commonly used in the Java language for callbacks ,  as Java does not allow multiple inheritance of classes, nor does it allow the passing of methods procedures as arguments.
Therefore, in order to pass a method as a parameter to a target method, current practice is to define and pass a reference to an interface as a means of supplying the signature and address of the parameter method to the target method rather than defining multiple variants of the target method to accommodate each possible calling class.
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Interfaces can extend several other interfaces, using the same formula as described below. Note how it allows multiple inheritance, unlike classes. Note also that Predator and Venomous may possibly define or inherit methods with the same signature, say kill Prey p.
When a class implements VenomousPredator it will implement both methods simultaneously. Some common Java interfaces are:.
Implementing an Interface
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