Certainly! Let's quickly recap the Java 8 features related to interfaces:

Java 8 Features: Interfaces

Default Methods

• Why Default Methods?

  • Prior to Java 8, adding a new method to an existing interface would break all classes implementing that interface.
  • Default methods allow us to add new methods to interfaces without affecting existing code.

• Syntax for Default Methods:

  interface MyInterface {
      void regularMethod(); // Regular abstract method
      
      default void defaultMethod() {
          // Default implementation
          System.out.println("This is a default method.");
      }
  }

• Usage:

  • Classes implementing the interface can choose to override the default method or use the provided implementation.
  • If a class overrides the default method, its implementation takes precedence.

Static Methods

• Static Methods in Interfaces:

  • Introduced in Java 8.
  • Associated with the interface itself (not tied to any specific instance).

• Syntax for Static Methods:

  interface MyInterface {
      static void staticMethod() {
          System.out.println("This is a static method.");
      }
  }

• Usage:

  • Call static methods directly on the interface (e.g., MyInterface.staticMethod()).
  • Cannot be overridden by implementing classes.

Constant Fields

• Declaring Constants in Interfaces:

  • Now possible in Java 8.
  • Constants are implicitly public, static, and final.
  • Example:

    interface MyConstants {
        int MAX_VALUE = 100;
        String DEFAULT_NAME = "John";
    }

• Usage:

  • Access constants using the interface name (e.g., MyConstants.MAX_VALUE).

Remember these features—they enhance code reusability and flexibility. Feel free to explore more Java topics as needed! 😊