Java Program to Remove Specified Element From ArrayList

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In this article, we will learn how to remove a specified element from an ArrayList in Java.

Java Program to Remove Specified Element From ArrayList

This can be done by using a simple built-in method remove(Object obj) of the ArrayList class.

Syntax:

public boolean remove(Object obj)

Parameters –

  1. Particular element to be removed

Let’s see the program to understand it more clearly.

Method: Java Program to Remove Specified Element From ArrayList By Using remove() Method

Approach:

  1. Create an ArrayList say al and add elements into it using add() method.
  2. Use the remove(Object obj) method defined above for different test cases (element in the list) as given in the below code.
  3. Display the updated ArrayList

Note:

  1. If the specified element which needs to be removed from ArrayList is not present then the method will return false.
  2. When there are duplicate elements, then first occurrence of specified element is removed from the ArrayList.

Program:

import java.util.ArrayList;
public class Main 
{
   public static void main(String args[]) 
   {

       //String ArrayList
       ArrayList<String> al = new ArrayList<String>();
       //Adding elements
       al.add("P");
       al.add("Q");
       al.add("R");
       al.add("X");
       al.add("S");
       al.add("T");

       // Displaying before removing element
       System.out.println("ArrayList before removal :");
       for(String ele: al)
       {
            System.out.println(ele);
       }
       
       //Removing P (Index - 0)
       al.remove("P");

       //Removing X (Index - 3) from the remaining list
       al.remove("X");

        // Displaying Remaining elements of ArrayList
         System.out.println("ArrayList After removal:");
       for(String ele: al)
       {
             System.out.println(ele);
       }
    }
}

Output:

ArrayList before removal :
P
Q
R
X
S
T
ArrayList After removal:
Q
R
S
T

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