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
