// Fig. 16.2: CollectionTest.java
// Collection interface demonstrated via an ArrayList object.
import java.util.List;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class CollectionTest {
   public static void main(String[] args) {
      // add elements in colors array to list
      String[] colors = {"MAGENTA", "RED", "WHITE", "BLUE", "CYAN"};
      List<String> list = new ArrayList<String>();

      for (String color : colors) {
         list.add(color); // adds color to end of list
      }

      // add elements in removeColors array to removeList
      String[] removeColors = {"RED", "WHITE", "BLUE"};
      List<String> removeList = new ArrayList<String>();

      for (String color : removeColors) {
         removeList.add(color);
      }

      // output list contents
      System.out.println("ArrayList: ");

      for (int count = 0; count < list.size(); count++) {
         System.out.printf("%s ", list.get(count));
      }

      // remove from list the colors contained in removeList
      removeColors(list, removeList);

      // output list contents
      System.out.printf("%n%nArrayList after calling removeColors:%n");

      for (String color : list) {
         System.out.printf("%s ", color);
      }
   } 

   // remove colors specified in collection2 from collection1
   private static void removeColors(Collection<String> collection1, 
      Collection<String> collection2) {
      // get iterator
      Iterator<String> iterator = collection1.iterator(); 

      // loop while collection has items
      while (iterator.hasNext()) {
         if (collection2.contains(iterator.next())) {   
            iterator.remove(); // remove current element
         }                                              
      } 
   } 
}


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