Iterator in Java

package collectionInterface;
import java.util.ArrayList;
import java.util.Iterator;

public class ListIteratorDemo {
public static void main(String[] args) {

ArrayList<String> al = new ArrayList<String>();

for (int i = 0; i < 5; i++) {
al.add(i + " item ");
}

Iterator il = al.iterator();

// #Printing all elements
while (il.hasNext()) {
System.out.println(il.next());
         }

System.err.println("________________________");
       

//Printing element based on condition
Iterator il2 = al.iterator();
while (il2.hasNext()) {

String str = (String) il2.next();
if (str.contains("4")) {

System.out.println(str);
}
}

}

}


/*OUTPUT########################################3
0 item
1 item
2 item
3 item
4 item
________________________
4 item
 */