OnJava8-Examples/interfaces/PureInterface.java

// interfaces/PureInterface.java
// (c)2020 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Interface only looked like this before Java 8

public interface PureInterface {
  int m1();
  void m2();
  double m3();
}