OnJava8-Examples/interfaces/ImplementingAnInterface.java

// interfaces/ImplementingAnInterface.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
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interface Concept { // Package access
  void idea1();
  void idea2();
}

class Implementation implements Concept {
  public void idea1() { System.out.println("idea1"); }
  public void idea2() { System.out.println("idea2"); }
}