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Java ArrayList set() Method with Example

ArrayList Class set() method: Here, we are going to learn about the set() method of ArrayList Class with its syntax and example.
Submitted by Preeti Jain, on January 18, 2020

ArrayList Class set() method

• set() method is available in java.util package.
• set() method is used to replace the element at the given indices with the given ele(element) in this Arraylist.
• set() method is a non-static method so it is accessible with the class object and if we try to access the method with the class name then we will get an error.
• set() method may throw an exception at the time of replacing an element.
  IndexOutOfBoundsException: This exception may throw when the given indices are not in a range.

Syntax:

    public T set (int indices, T ele);

Parameter(s):

• int indices – represents the indices of the given element to place.
• T ele – represents the element to store at the given indices.

Return value:

In the first case, the return type of the method is T, it returns the previous stored element at the given indices in this Arraylist.

Example:

// Java program to demonstrate the example 
// of T set(int, T) method of ArrayList.

import java.util.*;

public class SetOfArrayList {
    public static void main(String[] args) {
        // Create an ArrayList with initial 
        // capacity of storing elements

        ArrayList < String > arr_l = new ArrayList < String > (10);

        // By using add() method is to add 
        // elements in this ArrayList
        arr_l.add("C");
        arr_l.add("C++");
        arr_l.add("JAVA");
        arr_l.add("DOTNET");
        arr_l.add("PHP");

        // Display ArrayList
        System.out.println("ArrayList Elements :" + arr_l);

        // By using set(int, T) method is to return the
        // previous element stored at the given index 
        // and replace the previous element with the given
        // element in this ArrayList.

        String element = arr_l.set(3, "Python");

        // Display Returned Element
        System.out.println("arr_l.set(3,Python) : " + element);

        // Display ArrayList
        System.out.println("ArrayList Elements : " + arr_l);
    }
}

Output

ArrayList Elements :[C, C++, JAVA, DOTNET, PHP]
arr_l.set(3,Python) : DOTNET
ArrayList Elements : [C, C++, JAVA, Python, PHP]