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How to Replace a Element in Java ArrayList?

To replace an element in Java ArrayList, set() method of java.util. An ArrayList class can be used. The set() method takes two parameters-the indexes of the element which has to be replaced and the new element. The index of an ArrayList is zero-based. So, to replace the first element, 0 should be the index passed as a parameter.

Declaration:

public Object set(int index, Object element)

Return Value: The element which is at the specified index

Exception Throws: IndexOutOfBoundsException
This occurs when the index is out of range.

index < 0 or index >= size()

Implementation:

Here we will be proposing out 2 examples wherein one of them we will be setting the index within bound and in the other, we will be setting the index out of bounds.

Example 1: Where Index is Within Bound

Java

// Java program to demonstrate set() Method of ArrayList
// Where Index is Within Bound 
// Importing required classes

import java.io.*;

import java.util.*;
// Main class

class GFG {

// Main driver method

public static void main(String[] args) {

// Try block to check for exceptions

try {

// Creating an object of Arraylist class

ArrayList list = new ArrayList<>();

// Adding elements to the List

// using add() method

// Custom input elements

list.add("A");

list.add("B");

list.add("C");

list.add("D");

// Print all the elements added in the above object

System.out.println(list);

// 2 is the index of the element "C".

//"C" will be replaced by "E"

list.set(2, "E");

// Printing the newly updated List

System.out.println(list);

}

// Catch block to handle the exceptions

catch (Exception e) {

// Display the exception on the console

System.out.println(e);

}

}
}

Output [A, B, C, D] [A, B, E, D]

Example 2: Where Index is Out of Bound

Java

// Java program to demonstrate set() Method of ArrayList 
// Where Index is Out of Bound
// Importing required classes

import java.io.*;

import java.util.*;
// Main class

class GFG {

// Main driver method

public static void main(String[] args) {

// Try block to check for exceptions

try {

// Creating an object of Arraylist class

ArrayList list = new ArrayList<>();

// Adding elements to the List

// using add() method

// Custom input elements

list.add("A");

list.add("B");å

list.add("C");

list.add("D");

// Print all the elements added in the above object

System.out.println(list);

// Settijg the element at the 6 th index which

// does not exist in our input list object

list.set(6);

// Printing the newly updated List

System.out.println(list);

}

// Catch block to handle the exceptions

catch (Exception e) {

// Display the exception on the console

System.out.println(e);

}

}
}

Output:

Article Tags :

Java

Java Programs

Java-ArrayList

Java-Collections

Practice Tags :

Java

Java-Collections

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How to Replace a Element in Java ArrayList?

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