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
*/