Remove an element from Collection using Java Iterator Example

/*
  Remove an element from Collection using Java Iterator Example
  This Java Example shows how to remove an element from underlying Collection using
  Java Iterator's remove method.
*/
 
import java.util.Iterator;
import java.util.ArrayList;
 
public class RemoveElementThroughIteratorExample {
 
  public static void main(String[] args) {
 
    //create an ArrayList object
    ArrayList aList = new ArrayList();
 
    //populate ArrayList object
    aList.add("1");
    aList.add("2");
    aList.add("3");
    aList.add("4");
    aList.add("5");
 
 
    System.out.println("ArrayList before removal : ");
    for(int i=0; i< aList.size(); i++)
      System.out.println(aList.get(i));
 
    //get an Iterator
    Iterator itr = aList.iterator();
 
    //remove 2 from ArrayList using Iterator's remove method.
    String strElement = "";
    while(itr.hasNext()){
 
      /*
        Iterator's next method returns an Object so we need to cast it into
        appropriate class before using it.
      */
      strElement = (String)itr.next();
      if(strElement.equals("2"))
      {
        /*
          Remove an element using remove() method of Iterator
          Remove method removes an element from underlying collection and
          it may throw a UnsupportedOperationException if the remove
          operation is not supported.
        */
        itr.remove();
        break;
      }
 
 
 
    }
 
    System.out.println("ArrayList after removal : ");
    for(int i=0; i< aList.size(); i++)
      System.out.println(aList.get(i));
 
  }
}
 
/*
Output would be
ArrayList before removal :
1
2
3
4
5
ArrayList after removal :
1
3
4
5
*/