Java.util.ArrayList.add() Method in Java Last Updated : 21 Jun, 2020 Improve Improve Like Article Like Save Share Report Below are the add() methods of ArrayList in Java: boolean add(Object o) : This method appends the specified element to the end of this list. Parameters: object o: The element to be appended to this list. Exception: NA // Java code to illustrate add(Object o) import java.io.*; import java.util.ArrayList; public class ArrayListDemo { public static void main(String[] args) { // create an empty array list with an initial capacity ArrayList<Integer> arrlist = new ArrayList<Integer>(5); // use add() method to add elements in the list arrlist.add(15); arrlist.add(20); arrlist.add(25); // prints all the elements available in list for (Integer number : arrlist) { System.out.println("Number = " + number); } } } Output: Number = 15 Number = 20 Number = 25 void add(int index, Object element) : This method inserts the specified element E at the specified position in this list.It shifts the element currently at that position (if any) and any subsequent elements to the right (will add one to their indices). Parameters: index : The index at which the specified element is to be inserted. element : The element to be inserted. Exception: Throws IndexOutOfBoundsException if the specified index is out of range (index size()). // Java code to illustrate // void add(int index, Object element) import java.io.*; import java.util.ArrayList; public class ArrayListDemo { public static void main(String[] args) { // create an empty array list with an initial capacity ArrayList<Integer> arrlist = new ArrayList<Integer>(5); // use add() method to add elements in the list arrlist.add(10); arrlist.add(22); arrlist.add(30); arrlist.add(40); // adding element 35 at fourth position arrlist.add(3, 35); // let us print all the elements available in list for (Integer number : arrlist) { System.out.println("Number = " + number); } } } Output: Number = 10 Number = 22 Number = 30 Number = 35 Number = 40 Like Article Suggest improvement Previous ArrayList get(index) Method in Java with Examples Next Java.util.ArrayList.addall() method in Java Share your thoughts in the comments Add Your Comment Please Login to comment...