An interface in java is a blueprint of a class. It has static constants and abstract methods only.The interface in java is a mechanism to achieve fully abstraction.
In Java to implement multiple inheritance we use interfaces. Is it the only use of interfaces? If yes, what is the main use of interface in Java? Why do we need interfaces in Java?
Similarly, an interface extending another interface is not responsible for implementing methods from the parent interface. This is because interfaces cannot define any implementation. A child class can only extend a single class (abstract or concrete), whereas an interface can extend or a class can implement multiple other interfaces.
168 A Java class can only extend one parent class. Multiple inheritance (extends) is not allowed. Interfaces are not classes, however, and a class can implement more than one interface. The parent interfaces are declared in a comma-separated list, after the implements keyword. In conclusion, yes, it is possible to do:
155 Differences between static and default methods in Java 8: 1) Default methods can be overriden in implementing class, while static cannot. 2) Static method belongs only to Interface class, so you can only invoke static method on Interface class, not on class implementing this Interface, see:
165 interface: In general, an interface exposes a contract without exposing the underlying implementation details. In Object Oriented Programming, interfaces define abstract types that expose behavior, but contain no logic. Implementation is defined by the class or type that implements the interface. @interface : (Annotation type)
An interface in Java is similar to a class, but the body of an interface can include only abstract methods and final fields (constants). Recently, I saw a question, which looks like this inter...
In Java, this is valid code, even though Serializable is an interface, because ArrayList implements Serializable. So in this case, we're treating s as a variable of type Serializable.
Java "doesn't support the multiple inheritance of state, but it support multiple inheritance of implementation with default methods since java 8 release and multiple inheritance of type with interfaces.
