OnJava8-Examples/housekeeping/Measurement.java

// housekeeping/Measurement.java
// (c)2021 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.
class Depth {}

public class Measurement {
  Depth d = new Depth();
  // ...
}