Java.util.ArrayList.add() Method in Java 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 Last Updated : 21 Jun, 2020 Like Article Save Article 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...