How do you assign an element to an ArrayList?

Java.util.ArrayList.set[] Method

Description

The java.util.ArrayList.set[int index, E element] replaces the element at the specified position in this list with the specified element.

Declaration

Following is the declaration for java.util.ArrayList.set[] method

public E set[int index, E element]

Parameters

• index This is the index of the element to replace.

• element This is the element to be stored at the specified position.

Return Value

This method returns the element previously at the specified position.

Exception

IndexOutOfBoundsException If the index is out of range

Example

The following example shows the usage of java.util.Arraylist.set[] method.

package com.tutorialspoint; import java.util.ArrayList; public class ArrayListDemo { public static void main[String[] args] { // create an empty arraylist with an initial capacity ArrayList arrlist = new ArrayList[5]; // use add[] method to add elements in the list arrlist.add[15]; arrlist.add[20]; arrlist.add[25]; arrlist.add[22]; // let us print all the elements available in list for [Integer number : arrlist] { System.out.println["Number = " + number]; } // inserting elment 55 at 3rd position arrlist.set[2,55]; // let us print all the elements available in list System.out.println["Printing new list:"]; for [Integer number : arrlist] { System.out.println["Number = " + number]; } } }

Let us compile and run the above program, this will produce the following result

Number = 15 Number = 20 Number = 25 Number = 22 Printing new list: Number = 15 Number = 20 Number = 55 Number = 22