Java Implement Multiple Interfaces With Same Method
An interface in the java programming language is an abstract type that is used to specify a behavior that classes must implement. If in a class you are trying to implement two java interfaces which contains methods with same signature but diffrent return type in that case you will get compilation error.
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The reason you can t implement the same interface twice is because of type erasure.
Java implement multiple interfaces with same method. There s only one method named dostuff which is specified by both interfaces. It is true that a java class can implement multiple interfaces at the same time but there is a catch here. Consider the example below the button class implements two interfaces clickable and accessible.
According to jls 8 4 2 methods with same signature is not allowed in this case. To understand how to implement multiple interfaces with the same method name we take an example. Each interface defines a default method.
If your design requires different implementations of the dostuff method for the two interfaces then you ve got a problem because you can only have one implementation. And your posted code does implement it correctly. Is it possible to implement the interface twice with different generics unfortunately no.
Default methods in java 8 can be viewed as a form of multiple inheritance except that attribute can not be inherited. In this example we take two interfaces named as g1 and g2 with the same method name. To access the interface methods the interface must be implemented kinda like inherited by another class with the implements keyword instead of extends.
To give the specific implementation of each interface we need to specify the name of the interface followed by dot operator. The button class therefore can call methods from both interfaces. No its an error if two interfaces contain a method with the same signature but different return types then it is impossible to implement both the interface simultaneously.
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 all methods of an interface do not contain. The body of the interface method is provided by the implement class. If only one implementation of the method is given it is accessible to the class and all the interfaces which have the same method defined.
For example ifilelogger logerror.
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