== Why is this an issue?

include::description.adoc[]

=== Noncompliant code example

[source,text]
----
public class Person {
  static Date dateOfBirth;
  static int expectedFingers;

  public Person(date birthday) {
    dateOfBirth = birthday;  // Noncompliant; now everyone has this birthday
    expectedFingers = 10;  // Noncompliant
  }
}
----


=== Compliant solution

[source,text]
----
public class Person {
  Date dateOfBirth;
  static int expectedFingers = 10;

  public Person(date birthday) {
    dateOfBirth = birthday;
  }
}
----