Can we remove elements from ArrayList while iterating?

Use Iterator to remove an element from a Collection in Java

An element can be removed from a Collection using the Iterator method remove[]. This method removes the current element in the Collection. If the remove[] method is not preceded by the next[] method, then the exception IllegalStateException is thrown.

A program that demonstrates this is given as follows.

Example

Live Demo

import java.util.ArrayList; import java.util.Iterator; public class Demo { public static void main[String[] args] { ArrayList aList = new ArrayList[]; aList.add["Apple"]; aList.add["Mango"]; aList.add["Guava"]; aList.add["Orange"]; aList.add["Peach"]; System.out.println["The ArrayList elements are: "]; for [String s: aList] { System.out.println[s]; } Iterator i = aList.iterator[]; String str = ""; while [i.hasNext[]] { str = [String] i.next[]; if [str.equals["Orange"]] { i.remove[]; System.out.println["\nThe element Orange is removed"]; break; } } System.out.println["\nThe ArrayList elements are: "]; for [String s: aList] { System.out.println[s]; } } }

Output

The output of the above program is as follows

The ArrayList elements are: Apple Mango Guava Orange Peach The element Orange is removed The ArrayList elements are: Apple Mango Guava Peach