• What are interfaces?
• Implementing interfaces
• Multiple inheritance with interfaces
• Default and static methods

• Interface: Contract for classes
• Implements: Keyword to use interface
• Default Method: Method with body in interface

1. InterfaceDemo.java - Example of interface

1. Compile: javac InterfaceDemo.java
2. Run: java InterfaceDemo

1. Create an interface and implement it
2. Use default methods

Next Day: Day 21 - Packages and Imports