package test; import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class Test { public static void main(String[] args) { List list = new ArrayList(); list.add("1"); list.add("2"); list.add("3"); Iterator iterator = list.iterator(); while(iterator.hasNext()){ Object next = iterator.next(); if(next.equals("2")){ list.add("5"); }else{ System.out.println(next); } } System.out.println(list); } }