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0Java ArrayList remove() Method
What is an ArrayList?
ArrayList provides us with dynamic arrays. The ArrayLists are resizable in nature , we can add or remove an element at anytime. It is not compulsory to mention size while declaring it. The ArrayList is a part of Java framework and can be found in the java.util pacakge. ArrayList have many inbuilt methods which we can use. One of them is Java ArrayList remove() Method.
Here in the page we will discuus about the remove() method.
Java ArrayList remove() Method
Syntax :
ArrayList.remove(index/ element)
Parameters :
ArrayList: Name of the arraylist from which the element has to be removed. index: Index of the element which has to be removed from the list. Element: Element in the list which has to be removed.
Returns :
If index is passed as parameter , it removes the element from the specified position If object is passed as parameter , it removes the first occurrence of the object and returns true if object is present in the list.
ArrayList remove() Method Examples
Example 1:
When index is passed as parameter.
package com.company;
import java.util.ArrayList;
// Main class
public class prepInsta
{
// Main driver method
public static void main (String[]args)
{
//Creating an Integer ArrayList
List < Integer > list = new ArrayList <> ();
// adding elements in the list
list.add (1);
list.add (2);
list.add (3);
list.add (11);
list.add (21);
// calling remove() method using index
list.remove (1);
list.remove (1);
// Printing the updated ArrayList
System.out.println (list);
}
}
Output:
[1, 11, 21]
Example 2:
When value is passed as parameter OR user wants to remove the first occurrence of the element in the list.
package com.company;
import java.util.ArrayList;
// Main class
public class prepInsta
{
// Main driver method
public static void main (String[]args)
{
//Creating an Integer ArrayList
List < Integer > list = new ArrayList <> ();
// adding elements in the list
list.add (1);
list.add (2);
list.add (3);
list.add (11);
list.add (21);
// calling remove() method using index
list.remove (Integer.valueOf (2));
list.remove (Integer.valueOf (11));
// Printing the updated ArrayList
System.out.println (list);
}
}
Output:
[1, 3, 21]
Example 3:
When user wants to remove specified element from the list.
package com.company;
import java.util.ArrayList;
class PrepInsta {
public static void main(String[] args) {
// creating an String ArrayList
ArrayList list = new ArrayList<>();
// insert element to the arraylist
list.add("Prep");
list.add("Insta");
list.add("Prime");
// remove the element Prime from the list
boolean result = list.remove("Prime");
System.out.println("Is element Java removed? " + result);
System.out.println(list);
}
}
Output:
Is element Java removed? true [Prep, Insta]
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