## Why is this an issue?

Classes with only `private` constructors should be marked `final` to prevent any mistaken extension attempts.

### Noncompliant code example

    public class PrivateConstructorClass {  // Noncompliant
      private PrivateConstructorClass() {
        // ...
      }

      public static int magic(){
        return 42;
      }
    }

### Compliant solution

    public final class PrivateConstructorClass {  // Compliant
      private PrivateConstructorClass() {
        // ...
      }

      public static int magic(){
        return 42;
      }
    }