What are static default methods

In Java, starting from Java 8, interfaces gained the ability to have static and default methods. These additions were introduced to enhance the functionality of interfaces without breaking backward compatibility.

1. Static Methods:
   • Interfaces can now declare static methods, which are associated with the interface itself rather than an instance of the interface.
   • These methods can be invoked using the interface name, and they cannot be overridden by implementing classes.

                   
                       interface MyInterface {
                           static void staticMethod() {
                               System.out.println("Static method in MyInterface");
                           }
                       }
                       
                       public class MyClass implements MyInterface {
                           public static void main(String[] args) {
                               MyInterface.staticMethod(); // Invoking the static method
                           }
                       }                    
                   
               

2. Default Methods:
   • Default methods were introduced to allow interfaces to provide a default implementation of a method.
   • Classes that implement the interface can choose to use the default implementation or override it with their own implementation.

                   
                       interface MyInterface {
                           default void defaultMethod() {
                               System.out.println("Default method in MyInterface");
                           }
                       }
                       
                       public class MyClass implements MyInterface {
                           public static void main(String[] args) {
                               MyClass obj = new MyClass();
                               obj.defaultMethod(); // Using the default method
                           }
                       }                    
                   
               

If a class implements multiple interfaces and those interfaces have default methods with the same signature, a conflict arises. In such cases, the implementing class must provide its own implementation or explicitly choose the implementation from one of the interfaces using InterfaceName.super.methodName() syntax.

Static and default methods in interfaces are particularly useful for evolving existing codebases without breaking compatibility. They allow the addition of new methods to interfaces without requiring all implementing classes to provide their own implementation for the new methods.

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