AbstractSequentialList set(int, Object) method in Java with Example

The set() method of Java AbstractSequentialList is used to replace any particular element in the list created using the AbstractSequentialList class with another element. This can be done by specifying the position of the element to be replaced and the new element in the parameter of the set() method.

Syntax:

public E set(int index, Object element)

Parameters: This function accepts two parameters as shown in the above syntax and described below.

• index: This is of integer type and refers to the position of the element that is to be replaced from the list.
• element: It is the new element by which the existing element will be replaced and is of the same object type as the list.

Return Value: The method returns the previous value from the list that is replaced with the new value.

Exception: This method throws following exceptions:

• UnsupportedOperationException: if the set operation is not supported by this list
• ClassCastException: if the class of the specified element prevents it from being added to this list
• NullPointerException: if the specified element is null and this list does not permit null elements
• IllegalArgumentException: if some property of the specified element prevents it from being added to this list
• IndexOutOfBoundsException: if the index is out of range (index = size())

Below program illustrate the Java.util.AbstractSequentialList.set() method:

Example 1:

// Java code to illustrate set()

import java.io.*;
import java.util.*;

public class AbstractSequentialListDemo {
    public static void main(String args[])
    {
        // Creating an empty AbstractSequentialList
        AbstractSequentialList<String> list
            = new LinkedList<String>();

        // Use add() method to add elements in the list
        list.add("Geeks");
        list.add("for");
        list.add("Geeks");
        list.add("10");
        list.add("20");

        // Displaying the linkedlist
        System.out.println("AbstractSequentialList:"
                           + list);

        // Using set() method to replace Geeks with GFG
        System.out.println("The Object that is replaced is: "
                           + list.set(2, "GFG"));

        // Using set() method to replace 20 with 50
        System.out.println("The Object that is replaced is: "
                           + list.set(4, "50"));

        // Displaying the modified linkedlist
        System.out.println("The new AbstractSequentialList is:"
                           + list);
    }
}

Output:

AbstractSequentialList:[Geeks, for, Geeks, 10, 20]
The Object that is replaced is: Geeks
The Object that is replaced is: 20
The new AbstractSequentialList is:[Geeks, for, GFG, 10, 50]

Example 2: To demonstrate IndexOutOfBoundException

// Java code to illustrate set()

import java.io.*;
import java.util.*;

public class AbstractSequentialListDemo {
    public static void main(String args[])
    {
        // Creating an empty AbstractSequentialList
        AbstractSequentialList<String> list
            = new LinkedList<String>();

        // Use add() method to add elements in the list
        list.add("Geeks");
        list.add("for");
        list.add("Geeks");
        list.add("10");
        list.add("20");

        // Displaying the linkedlist
        System.out.println("AbstractSequentialList:"
                           + list);

        // Using set() method to replace 10th with GFG
        // and the 10th element does not exist
        System.out.println("Trying to replace 10th "
                           + "element with GFG");

        try {
            list.set(10, "GFG");
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output:

AbstractSequentialList:[Geeks, for, Geeks, 10, 20]
Trying to replace 10th element with GFG
java.lang.IndexOutOfBoundsException: Index: 10, Size: 5