ArrayList set() method in Java with Examples

The set() method of java.util.ArrayList class is used to replace the element at the specified position in this list with the specified element.

Syntax:

public E set(int index, E element)

Parameters: This method takes the following argument as a parameter.

  • index- index of the element to replace
  • element- element to be stored at the specified position

Returns Value: This method returns the element previously at the specified position.

Exception: This method throws IndexOutOfBoundsException if the index is not within the size range of the ArrayList.

Below are the examples to illustrate the set() method.

Example 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to demonstrate
// set() method
// for Integer value
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv) throws Exception
    {
        try {
  
            // Creating object of ArrayList<Integer>
            ArrayList<Integer>
                arrlist = new ArrayList<Integer>();
  
            // Populating arrlist1
            arrlist.add(1);
            arrlist.add(2);
            arrlist.add(3);
            arrlist.add(4);
            arrlist.add(5);
  
            // print arrlist
            System.out.println("Before operation: "
                               + arrlist);
  
            // Replacing element at the index 3 with 30
            // using method set()
            int i = arrlist.set(3, 30);
  
            // Print the modified arrlist
            System.out.println("After operation: "
                               + arrlist);
  
            // Print the Replaced element
            System.out.println("Replaced element: "
                               + i);
        }
  
        catch (IndexOutOfBoundsException e) {
            System.out.println("Exception thrown: "
                               + e);
        }
    }
}

chevron_right


Output:

Before operation : [1, 2, 3, 4, 5]
After operation : [1, 2, 3, 30, 5]
Replaced element : 4

Example 2: For IndexOutOfBoundsException

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to demonstrate
// set() method
// for IndexOutOfBoundsException
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv) throws Exception
    {
        try {
  
            // Creating object of ArrayList<Integer>
            ArrayList<Integer>
                arrlist = new ArrayList<Integer>();
  
            // Populating arrlist1
            arrlist.add(1);
            arrlist.add(2);
            arrlist.add(3);
            arrlist.add(4);
            arrlist.add(5);
  
            // print arrlist
            System.out.println("Before operation : "
                               + arrlist);
  
            // Replacing element at the index 7 with 30
            // using method set()
            System.out.println("\nTrying to Replace"
                               + " the element at"
                               + " (index > Capacity) ");
            int i = arrlist.set(7, 30);
  
            // Print the modified arrlist
            System.out.println("After operation: "
                               + arrlist);
  
            // Print the Replaced element
            System.out.println("Replaced element: "
                               + i);
        }
  
        catch (IndexOutOfBoundsException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}

chevron_right


Output:

Before operation : [1, 2, 3, 4, 5]

Trying to Replace the element at (index > Capacity) 
Exception thrown : java.lang.IndexOutOfBoundsException: Index: 7, Size: 5


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.