Collection program not working as expected

Hi the following program is from Deitel with minor modifications. The method removeColors is just as it is in the book. The colors BLUE,RED,GREEN are expected to be removed but they are still present after the method runs.

import java.util.*;

public class collTest1{

private static final String [] colors =
          {"CHARTREUSE","BLUE","RED","GREEN","CYAN"};

private static final String [] removeColors =
          {"BLUE","RED","GREEN"};

public collTest1(){
         List <String> list = new ArrayList<String>();
         List <String> removeList = new ArrayList<String>();

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

for(String color:colors)
            list.add(color);
         
         System.out.println("ArrayList: ");

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

for(int count = 0;count < removeList.size();count++)
            System.out.printf("\n%s ",removeList.get(count));

removeColors(list,removeList);

System.out.println("\n\nArrayList after calling removeColors ");

for(String s:colors)
            System.out.printf("%s ", s);
     }

private 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 Color
     } // end method removeColors

public static void main(String [] args){
         collTest1 c = new collTest1();
}
}[code=java]

Hi I made some changes to the program and it worked. The SOP after removeColors() had to be modified. Thanks