import java.util.*;

/**
  * Sample JUnit for SWE 619
  * @author Paul Ammann
  * See also MinTest.java and AllTests.java
  */

public class Min {

  /**
    * Returns the mininum element in a list
    * @param list Comparable list of elements to search
    * @return the minimum element in the list
    * @throws NullPointerException if list is null or
    *         if any list elements are null
    * @throws ClassCastException if list elements are not mutually comparable
    * @throws IllegalArgumentException if list is empty
    */
    public static Comparable min (List<Comparable> list) {
       Iterator itr = list.iterator();
       if (itr.hasNext() == false) {
          throw new IllegalArgumentException("min: Empty list");
       }

       Comparable result = (Comparable) itr.next();
       if (result == null) throw new NullPointerException("Assignment3.min");

       while (itr.hasNext()) {
           Comparable comp = (Comparable) itr.next();
           if (comp.compareTo(result) < 0) {    // throws NPE, CCE as needed
               result = comp;
           }
       }
       return result;
    }
}