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<String> aList = new ArrayList<String>();
      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("
The element Orange is removed");
            break;
         }
      }
      System.out.println("
The 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

Arjun Thakur

e

Updated on: 29-Jun-2020

16K+ Views

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