ArrayList set() method in Java with Examples

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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:

// 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);
        }
    }
}

Output:

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

Example 2: For IndexOutOfBoundsException

// 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);
        }
    }
}

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