Private Method in Interface | Java 9 | Why Introduced & Why Is It Needed?

In this video, we will learn about Private Methods in Interface, a feature introduced in Java 9. Before Java 9, interfaces could contain abstract methods, and from Java 8, interfaces also supported default methods and static methods. But when multiple default methods need some common internal functionality, code duplication can become a problem. To solve this problem, Java 9 introduced private methods inside interfaces. In this video, we will understand why private methods were introduced, how they work, where they can be used, and what their important rules are. 📌 Topics Covered ✅ What is a Private Method in Interface? ✅ Private Method introduced from Java 9 ✅ Why Java 9 introduced Private Methods in Interface ✅ Need for Private Methods ✅ Syntax of Private Method ✅ Private Method must have a method body ✅ How Private Methods are used inside an Interface ✅ Scope and access of Private Methods ✅ Important rules of Private Methods ✅ Can a class access the Interface's private method? ✅ Can an implementing class override a private method? ✅ Advantages of Private Methods ✅ Code Reusability ✅ Reducing Code Duplication ✅ Improving Code Maintainability ✅ Important Java Interview Points Why Private Methods? Private methods are mainly used for internal implementation inside an Interface. They allow us to keep common functionality in one place and reuse that functionality from other methods of the same Interface. This helps to: Improve code reusability Reduce code duplication Keep common functionality in one place Improve code maintainability Hide internal implementation It cannot be directly accessed from outside the Interface or by the implementing class. This is an important topic for Core Java, OOPs, Java 9 Features, Interfaces and Java Interview Questions. If you are preparing for a Java Developer interview or learning Core Java, make sure you understand this concept clearly. 📌 Watch the complete video to understand Private Method in Interface with a simple explanation and example. Like 👍 | Share ↗️ | Subscribe 🔔 to Mission Java Programming Keep practice and enjoy coding. #java #corejava #java9 #interface #privatemethod #oops #javainterview #javaprogramming #javafeatures #coding