Interfaces

Interfaces

Interfaces is a core part of Java. In this case file you'll learn what it is, why it matters, and how to use it in real code.

Understanding interfaces well means you can read other people's Java code with confidence, and avoid the most common beginner mistakes in this area.

Key points:

• What interfaces means in the context of Java
• A minimal example you can run or read in the playground on the right
• A common mistake to avoid when working with interfaces

// Java: Interfaces
public class Demo {
  public static void main(String[] args) {
    System.out.println("Exploring Interfaces");
  }
}

Tip: Try changing a value in the code on the right and re-running it — small experiments are the fastest way to build real intuition for interfaces.