From the official Oracle Javadoc:

NOTE: The functionality of this Enumeration interface is duplicated by the Iterator interface. In addition, Iterator adds an optional remove operation, and has shorter method names. New implementations should consider using Iterator in preference to Enumeration.

Noncompliant Code Example

public class MyClass implements Enumeration {  // Non-Compliant
  /* ... */
}

Compliant Solution

public class MyClass implements Iterator {     // Compliant
  /* ... */
}