By contract, any implementation of the ``++java.util.Iterator.next()++`` method should throw a ``++NoSuchElementException++`` exception when the iteration has no more elements. Any other behavior when the iteration is done could lead to unexpected behavior for users of this ``++Iterator++``. 

== Noncompliant Code Example

----
public class MyIterator implements Iterator<String>{
  ...
  public String next(){
    if(!hasNext()){
      return null;
    }
    ...
  }
}
----

== Compliant Solution

----
public class MyIterator implements Iterator<String>{
  ...
  public String next(){
    if(!hasNext()){
      throw new NoSuchElementException();
    }
    ...
  }
}
----