![]() ![]() ![]() Interfaces do not contain constructors as they are not meant to be instantiated.Interfaces may contain static and final variables which are useful if you want to package a constant variable inside the interface which is available to all classes implementing the interface.All fields declared inside an interface are public, static and final by default.However, since Java 8, an interface can have default and static methods too with their body defined. ![]() Prior to Java 8, all methods declared inside a Java interface must be abstract methods, i.e.An interface an extend any number of interfaces using the following syntax:.All methods defined in the interface are implicitly public so one can omit the public access modifier in the interface definition. You can think of an implementing class as a context that disambiguates the meaning of concepts defined in an interface. Interfaces contain a high-level description of concepts that express their disambiguated meaning whenever it is being defined. In other words, an interface articulates the agreement that you expect from the implementing class to conform. We may think of it as writing your expectations of the class that intends to implement your interface. What is InterfaceĪn interface spells out the contract for the implementing class. Interfaces, on the other hand, extend the limitations of class inheritance in Java as one can simulate the effect of multiple inheritance through interfaces. However, an abstract class can declare constructs that interfaces cannot such as methods that are non-static and final, and methods that are private, protected, and public. Additionally, it is not possible to instantiate abstract classes and interfaces. Defining a contract guarantees that the implementing class contains the properties we expect from it. In Java, both abstract class and interface can declare a contract that the implementing class must satisfy. ![]()
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