How to remove an element from ArrayList in Java?

Java Programming Java 8 Object Oriented Programming

There are three ways to remove an element from a ArrayList in Java.

Using remove(index) - This method takes the index of ArrayList and remove the required element from the ArrayList.
Using remove(Object) - This method takes the object of ArrayList and remove it from the ArrayList.
Using Iterator.remove() - This method removes the element without causing ConcurrentModificationException.

Example

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Tester{
   public static void main(String[] args) {
      List<Integer> list = new ArrayList<>();
      list.add(1);
      list.add(2);
      list.add(3);
      list.add(4);
      list.add(5);
      list.add(6);

      System.out.println(list);
      //remove by index
      list.remove(5);
      System.out.println(list);

      //remove by Object
      list.remove(new Integer(5));

      //remove using iterator
      Iterator<Integer> iterator = list.iterator();

      while(iterator.hasNext()){
         if(iterator.next() == 4){
            iterator.remove();
         }
      }
      System.out.println(list);
   }
}

Output

[1, 2, 3, 4, 5, 6]
[1, 2, 3, 4, 5]
[1, 2, 3]

Ankith Reddy

Published on 19-Sep-2018 07:13:43

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