title: How to depict "class uses class" relationship via UML
body: <p><strong>Case A</strong>
  Say you have 2 classes <code>Model</code> and <code>Settings</code>.</p>
  
  <p>Settings contains nothing but <code>public static</code> constants used throughout the application. What type of relationship would you say these 2 classes have?</p>
  
  <p><strong>Case B</strong> Say you have a <code>IntersectionManager</code> <code>singleton</code> class that is being used by classes <code>Road</code> and <code>Car</code> to get some data out of it.</p>
  
  <p>What is the name of "<strong>class uses class</strong>" relationship in UML?</p>
  
  <p>Would you use the same relationships for both case A and case B?
  What UML arrow would you use to demonstrate this relationship?</p>