Implement within the interface – Java

We know that we cannot implement functions in interfaces in Java

I just tried

public interface InvoiceService {

public static void getData(){
    System.out.print("this is my data");
 }
}

I can perform this function. Why? Is it because functions are defined as static and static variables that can be accessed directly using class names without creating objects?

Solution

Because you may be using java 8 In Java 8, you can add static methods and default methods to the interface Read more about static and default methods in the Java 8 documentation