Java ArrayList remove(Object obj) Method example

In this guide, you will learn how to remove a specified element from an ArrayList using remove() method. The method remove(Object obj) removes the first occurrence of the specified object(element) from the list. It belongs to the java.util.ArrayList class.

public boolean remove(Object obj)

Note:

• It returns false if the specified element doesn’t exist in the list.
• If there are duplicate elements present in the list it removes the first occurrence of the specified element from the list.

Java Program to demonstrate ArrayList.remove(Object obj) method

In this example, we have an ArrayList of strings. We can remove a specific string from the list using remove() method.

import java.util.ArrayList;
public class RemoveExample {
   public static void main(String args[]) {
       //String ArrayList
       ArrayList<String> al = new ArrayList<>();
       al.add("AA");
       al.add("BB");
       al.add("CC");
       al.add("DD");
       al.add("EE");
       al.add("FF");

       // Displaying arraylist before removing any element
       System.out.println("ArrayList before remove:");
       for(String var: al){
           System.out.println(var);
       }

       //Removing element AA from the arraylist
       al.remove("AA");
       //Removing element FF from the arraylist
       al.remove("FF");
       //Removing element CC from the arraylist
       al.remove("CC");

       // The element "GG" doesn't exit in the list so this
       // method returns false, which is stored in variable b
       boolean b = al.remove("GG");
       System.out.println("Element GG removed: "+b);

       // Displaying arraylist after all the remove operations
       System.out.println("ArrayList After remove:");
       for(String var2: al){
           System.out.println(var2);
       } 
   }
}

Output:

ArrayList before remove:
AA
BB
CC
DD
EE
FF
Element GG removed: false
ArrayList After remove:
BB
DD
EE